Place a frying pan on a stove and set to medium-high heat. Pour one tablespoon of olive oil and allow for a couple of minutes to be hot. Lightly fry the tomato and onion.
Carefully drop the beef in the frying pan and add the paprika, salt, and black pepper to taste. Allow it to sear for around 7 to 10 minutes.
Now place the lettuce leaf on a board. Using a spoon, scoop a sizable amount of the beef and place on the lettuce leaf. Spread the sour cream and avocado on top of the beef and then gently roll the leaf. Continue the process for the rest of the lettuce leaves.
Serve in a plate and enjoy your tasty lunch!