Crisp butter-lettuce cups piled with spiced, thin-sliced steak, charred peppers and onions, creamy guacamole and cheddar for a low-carb, taco-style dinner that's bright, savory, and easy to assemble.
Lettuce Cup Steak Tacos: A Lighter Taco Night
Crisp butter‑lettuce cups cradle thin‑sliced, spice‑kissed flank steak with charred peppers, creamy guacamole and cheddar for a quick, low‑carb dinner that assembles in minutes.
If you love tacos but want to skip the tortillas, this build‑your‑own lettuce taco bar is the happiest compromise. Butter lettuce leaves are sturdy yet tender—perfect little boats for smoky, thin‑sliced steak and all the toppings you love. It’s the kind of dinner that feels festive but is easy enough for a weeknight.
Flank steak is the star: trimmed, patted dry and rubbed with a simple mix of olive oil, chili powder, cumin, garlic powder, salt and pepper so every bite is savory and aromatic. A very hot cast‑iron skillet gives the steak a fast, flavorful sear; let it rest before slicing thinly against the grain so the meat stays juicy and easy to bite into. In the same pan, a quick sauté of red bell pepper and onion gets a little char and sweetness that plays perfectly off the spiced beef.
Texture is everything here—crisp lettuce, tender steak, slightly charred veggies, creamy guacamole and shredded cheddar for a salty, melty finish. Keep the guac silky and the sour cream dolloped on the side so everyone can customize the brightness and richness of their cup. Small touches like a squeeze of lime or a sprinkle of flaky salt make a huge difference.
This is an ideal make‑ahead meal: rub and rest the steak ahead of time, or cook and slice it an hour before service and reheat briefly in the skillet. Wash and chill the lettuce leaves so they’re ready to fill, and lay out bowls of toppings for a casual taco bar—great for feeding a family, hosting friends, or keeping dinners low‑fuss all week.
Ingredients
How to Make Keto-ish Steak Lettuce Taco Bar
- Trim any excess fat from the flank steak and pat it dry, then place it on a cutting board.
- In a small bowl whisk together olive oil, chili powder, ground cumin, garlic powder, kosher salt, and black pepper; brush or rub the mixture over both sides of the steak and let rest at room temperature 10–15 minutes while you prep the vegetables.
- Heat a large cast-iron skillet or grill over medium-high heat until very hot; sear the steak 4–5 minutes per side for medium-rare (adjust 1–2 minutes per side for desired doneness), then transfer to a cutting board and tent with foil to rest 8–10 minutes.
- While the steak rests, core and thinly slice the red bell pepper and yellow onion; heat a tablespoon of oil in the same skillet over medium-high and sauté the peppers and onions 6–8 minutes until softened and slightly charred; season with a pinch of salt and set aside.
- Make quick guacamole by halving and scooping the avocados into a bowl, mashing with the juice of one lime, 1/4 tsp salt, chopped cilantro (reserve some for garnish), and finely chopped jalapeño if using; taste and adjust salt/lime.
- Halve the cherry tomatoes and toss with a squeeze of lime and a pinch of salt to make a quick pico; shred the cheddar if needed and separate butter lettuce leaves for serving.
- Slice the rested steak thinly against the grain into 1/4-inch strips; keep warm or briefly return slices to the skillet for 30 seconds if you prefer hotter meat.
- Arrange a taco bar: lettuce leaves as cups, topped with steak slices, sautéed peppers and onions, a spoonful of guacamole, a dollop of sour cream, cherry tomatoes, shredded cheddar, cilantro, and lime wedges for squeezing.
- To store leftovers, refrigerate steak slices and toppings separately in airtight containers for up to 3 days; reheat steak gently in a hot skillet 1–2 minutes per side or enjoy cold in a salad.
Recipe Card
Keto-ish Steak Lettuce Taco Bar
Crisp butter-lettuce cups piled with spiced, thin-sliced steak, charred peppers and onions, creamy guacamole and cheddar for a low-carb, taco-style dinner that's bright, savory, and easy to assemble.
- Prep
- 15 min
- Cook
- 15 min
- Servings
- 4
Ingredients
Instructions
- Trim any excess fat from the flank steak and pat it dry, then place it on a cutting board.
- In a small bowl whisk together olive oil, chili powder, ground cumin, garlic powder, kosher salt, and black pepper; brush or rub the mixture over both sides of the steak and let rest at room temperature 10–15 minutes while you prep the vegetables.
- Heat a large cast-iron skillet or grill over medium-high heat until very hot; sear the steak 4–5 minutes per side for medium-rare (adjust 1–2 minutes per side for desired doneness), then transfer to a cutting board and tent with foil to rest 8–10 minutes.
- While the steak rests, core and thinly slice the red bell pepper and yellow onion; heat a tablespoon of oil in the same skillet over medium-high and sauté the peppers and onions 6–8 minutes until softened and slightly charred; season with a pinch of salt and set aside.
- Make quick guacamole by halving and scooping the avocados into a bowl, mashing with the juice of one lime, 1/4 tsp salt, chopped cilantro (reserve some for garnish), and finely chopped jalapeño if using; taste and adjust salt/lime.
- Halve the cherry tomatoes and toss with a squeeze of lime and a pinch of salt to make a quick pico; shred the cheddar if needed and separate butter lettuce leaves for serving.
- Slice the rested steak thinly against the grain into 1/4-inch strips; keep warm or briefly return slices to the skillet for 30 seconds if you prefer hotter meat.
- Arrange a taco bar: lettuce leaves as cups, topped with steak slices, sautéed peppers and onions, a spoonful of guacamole, a dollop of sour cream, cherry tomatoes, shredded cheddar, cilantro, and lime wedges for squeezing.
- To store leftovers, refrigerate steak slices and toppings separately in airtight containers for up to 3 days; reheat steak gently in a hot skillet 1–2 minutes per side or enjoy cold in a salad.
Nutrition
- Carbohydrates
- 14
- Saturated Fat
- 13
- Sodium
- 850
- Fiber
- 6.5
- Unsaturated Fat
- 31
- Protein
- 36
- Fat
- 45
- Cholesterol
- 110
- Trans Fat
- 0
- Calories
- 600
- Sugar
- 4.5