Easy Thai Beef Salad

Name: Easy Thai Beef Salad
Prep time: 1 h
Cook time: 10 min
Total time: 1 h 10 min
Cuisine: Thai
Ingredients: 1 lb beef flank steak (thinly sliced against the grain); 3 limes (juiced); 2 tablespoons fish sauce; 3 cloves garlic (crushed); 1/2 teaspoon crushed red pepper flakes; 4 limes (juiced (about 1/3 cup)); 3 tablespoons fish sauce; 2 teaspoons soy sauce; 3 tablespoons sugar; 2 tomatoes (halved and sliced); 1 cucumber (halved and sliced); 2 cups fresh cilantro leaves (roughly chopped); 1/2 red onion (thinly sliced); 1 head romaine lettuce (sliced)