Easy Fish Tacos with a Tzatziki Fish Taco Sauce

Name: Easy Fish Tacos with a Tzatziki Fish Taco Sauce
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: TexMex
Ingredients: 2 pounds fish fillets (grilled or cooked); 12 whole corn tortillas; 3 tablespoons bacon grease; 1/2 head lettuce; 6 whole Roma tomatoes (chopped); 4 ounces Monterey Jack cheese (shredded); 4 ounces cheddar cheese (shredded); 6 whole green onions (chopped); 1/4 cup cilantro (optional); 1/2 cup tzatziki sauce