Cheesy Beef Tostadas

While beef cooks, core and seed green pepper. Halve lengthwise, then slice into thin strips. Halve and peel onion; thinly slice one half (save the other for the next step). Once beef browns, add green pepper and onion slices to same pan along with a pinch of salt. Cook, tossing, until veggies are tender, about 5 minutes.

Pour ¼ cup water and stock concentrate into pan. Simmer until most of the liquid evaporates, about 1 minute. Season with salt, then remove pan from heat and set aside. Cut tomato into small cubes. Roughly chop cilantro. Cut lime into quarters. Very finely chop enough of the remaining onion to give you 2 TBSP (use the rest as you like).

Place tomato, cilantro, chopped onion, juice from two lime quarters, and a pinch of salt and pepper in a medium bowl. Toss to combine and set aside. In a separate small bowl, stir together sour cream and as much hot sauce as you like. Stir in water 1 tsp at a time until mixture has a drizzling consistency. Season with salt and set aside.

Drizzle tortillas on all sides using 1 TBSP olive oil and brush to coat evenly. Arrange in a single layer on a baking sheet. Gently prick each tortilla in a few places with a fork. Place under broiler and broil until lightly toasted on top, about 2 minutes. Flip tortillas over with tongs or a spatula. Return to broiler and toast on other side, about 2 minutes more. TIP: Keep an eye out for any burning the entire time.