Korean-Style Sesame Beef Radicchio Cups
Thin slices of sirloin seared hot with garlic, ginger, and coconut aminos, then spooned into crisp radicchio cups and topped with lime-pickled cucumber and carrot, sliced scallions, and nutty sesame seeds.
Why You'll Love This Recipe
This is a bright, savory hand-held lunch for anyone who wants something bold and quick without heavy carbs weighing them down. The warm sesame-ginger beef sits inside cool, crunchy radicchio, so every bite has heat, snap, and a little bitterness all at once. It comes together in about the time it takes the beef to sear, which makes it a realistic weekday meal rather than a project.
Each cup carries a contrast of temperature and texture. Searing the sirloin over high heat browns the surface and develops the deep, roasted flavor that carries the whole dish, while the coconut aminos reduce into a glossy, slightly sweet-salty glaze that clings to the meat. The lime-pickled cucumber and carrot cut straight through that richness with acidity and crunch, and the radicchio's gentle bitterness keeps the whole thing from tasting flat. Slicing the beef against the grain is the small move that keeps it tender instead of chewy.
It satisfies because it leads with protein and finishes with fresh vegetables, so it fills you up without leaving you sluggish. The sirloin gives you a substantial, savory center, the sesame oil and seeds add richness that makes a modest amount of food feel generous, and the raw radicchio, cucumber, and carrot bring water, fiber, and crunch that make it refreshing. It eats light but does not leave you hungry an hour later.
Ingredients
- 12 oz sirloin steak, thinly sliced
- 12 radicchio leaves, for cups
- 1/2 cucumber, thinly sliced
- 1 medium carrot, julienned
- 2 tbsp coconut aminos
- 1 tbsp sesame oil
- 3 cloves garlic, minced
- 1 tbsp fresh ginger, grated
- 3 scallions, sliced
- 1 tbsp sesame seeds
- 1 tbsp fresh lime juice
Instructions
- Prep the produce and beef: Gently peel the radicchio apart into whole cup-shaped leaves, rinse, and pat dry. Thinly slice the cucumber into rounds, julienne the carrot into thin matchsticks, mince the garlic, grate the ginger on a fine grater, and thinly slice the scallions. Slice the sirloin against the grain into thin strips no thicker than a pencil, since cutting with the grain leaves long fibers that eat tough however briefly they see the pan.
- Quick-pickle the vegetables: In a small bowl, toss the sliced cucumber and julienned carrot with the lime juice and a pinch of the scallions. Set aside to lightly pickle while you cook the beef, tossing once or twice, because the lime needs those few minutes to draw the water out of the cucumber and take the raw edge off the carrot.
- Sear the beef: Heat the sesame oil in a skillet over high heat until it shimmers. Add the sliced sirloin in a single layer and sear, stirring only occasionally, for 3 to 4 minutes until the strips are well browned and no longer pink, since beef stirred constantly releases its water and simmers in it instead of browning. Add the minced garlic and grated ginger and cook 1 minute more, stirring constantly, until fragrant but not burnt.
- Glaze the beef: Pour in the coconut aminos and toss for 1 to 2 minutes until the liquid reduces slightly and the beef looks glossy and coated. Remove the skillet from the heat and stir in half of the sliced scallions, so that they keep a little of their bite rather than collapsing into the glaze.
- Assemble the cups: Fill each radicchio cup with a spoonful of the sesame beef. Lift the pickled cucumber and carrot from their liquid rather than spooning it over, because the liquid will run straight through the leaf and take the cup apart, then finish with the sesame seeds and the remaining scallions. Serve right away while the beef is warm and the cups are crisp.
Variations
- Milder cups: If radicchio's bitterness is too much, swap in whole endive spears or butter lettuce leaves for a sweeter, softer cup that still holds the filling.
- Turn up the heat: Add a spoonful of Korean chili flakes or a few slices of fresh chili to the beef as it glazes for a warming kick.
- Swap the protein: Use thinly sliced boneless chicken thigh in place of the sirloin, searing until cooked through and no longer pink; the ginger and coconut aminos work just as well on poultry.
- Make it seafood: Replace the beef with peeled shrimp, searing just until pink and opaque; this adds shellfish, and shrimp cooks faster, so watch it closely.
- Extra crunch in the pickle: Toss a handful of julienned daikon or thin bell pepper strips in with the cucumber and carrot for more color and bite in the quick pickle.
Storage & Leftovers
Store the components separately in the refrigerator for the best texture: keep the cooked beef in one airtight container, the pickled cucumber and carrot in another, and the radicchio leaves wrapped in a paper towel in a third. The beef and pickled vegetables keep for up to three days; the radicchio stays crisp for about two days before it starts to wilt at the edges.
Reheat only the beef, gently, in a skillet over medium heat with a splash of water to loosen the glaze, just until warmed through. Avoid the microwave if you can, since it tends to overcook the thin slices and toughen them. Leave the pickled vegetables and radicchio cold and assemble everything fresh once the beef is warm.
To get ahead, cook and glaze the beef and make the pickle up to a day in advance and refrigerate them. Keep the radicchio unfilled until serving so the leaves stay firm, and assemble the cups just before you eat so they do not turn soggy.
Notes & Tips
- Pick a well-marbled sirloin: Choose a sirloin with a little visible fat running through it; the plainer the cut, the more quickly it can turn dry over the high heat this recipe uses.
- Slice the beef cold: Firm the steak in the freezer for about fifteen minutes before slicing so you can cut clean, thin strips against the grain, which is what keeps each bite tender.
- Give the pickle time to work: The cucumber and carrot taste best when they sit in the lime juice while the beef cooks; a slightly longer soak gives a sharper, more pickled bite.
- Save the sturdy leaves for cups: Use the firmer outer radicchio leaves for the cups and thinly shred any small torn inner ones to tuck in under the filling so nothing goes to waste.
- Don't crowd the skillet: Sear the beef in a single layer over high heat; if the pan is packed, the meat steams and stays gray instead of browning, so cook it in two batches if your skillet is small.
- Adjust the salt with the glaze: Coconut aminos carry the salty backbone here, so taste the beef after glazing and add a little more only if it needs it, since the sesame and lime already build a lot of flavor.
Nutrition & Mindful Eating
- Everything about this is a contrast set up on purpose. The beef goes in hot and savory, the radicchio stays cold and bitter, and the cucumber and carrot underneath are wet and crisp against meat that has just come off the heat.
- Radicchio leaves curl naturally into cups, which is the practical reason they are here, and the bitter edge they carry is what stops the sweet-salty beef from taking over. That deep purple comes from anthocyanins, and the leaves bring fiber along with them.
- Sirloin sliced thin against the grain cooks in a couple of minutes and stays tender, and the coconut aminos caramelize on it as the pan dries out. It carries the protein, iron and B12 that turn a plate of leaves into an actual lunch.
- Cucumber and carrot cut into matchsticks stay raw and cold, and the lime juice over them keeps everything clean and sharp. The carrot brings its beta-carotene and a faint sweetness that sits nicely under the ginger.
- A few of these cups hold you longer than their size suggests, and the beef is doing most of that work while the sesame oil and seeds add the fat that rounds it out. Building them one at a time is what makes a small amount of meat go far.
- As you eat, hold each cup in your hand and feel the cold leaf give way before the warm beef arrives, and let the fact that this takes both hands keep you from rushing the plate.
Frequently Asked Questions
How do I keep the radicchio cups from getting soggy?
Assemble them just before eating and lift the pickled cucumber and carrot out of their liquid so excess juice does not pool in the leaves. If you are packing them for later, carry the beef, pickle, and leaves separately and fill the cups when you are ready to eat.
My beef came out tough. What went wrong?
Usually it is either the slicing or the pan. Slice the sirloin thinly and against the grain, and sear it in a single layer over high heat so it browns quickly instead of steaming and toughening. Once it is browned and the glaze is glossy, take it off the heat promptly.
What can I use instead of coconut aminos?
Coconut aminos give the beef its salty-sweet glaze without soy. If you are not restricted, tamari would give a similar savory depth, though it is saltier, so start with less and taste as you go. Keep in mind tamari is soy-based.
Can I make this ahead for meal prep?
Yes. Cook the beef and make the pickle up to a day ahead and refrigerate them in separate containers, and keep the radicchio leaves whole and unfilled. Warm just the beef gently before serving and assemble fresh so the cups stay crisp.