Bistec Ranchero Con Papas

Name: Bistec Ranchero Con Papas
Ingredients: 1 cup vegetable oil; 2 medium russet potatoes or 3 smaller potatoes (thinly sliced); 1 lb breakfast steak or any other thin steak (thinly sliced); 1 garlic clove (chopped); 1/2 medium white or yellow onion (thinly sliced); 1 chile Anaheim, jalapeño or serrano peppers (see note 1) (remove seeds for less spicy dish); 3 Roma tomatos; 4 oz Tomato sauce; 1/2 tsp kosher salt or more to taste; 1/4 tsp black ground pepper or more to taste; 1 cup water (or more if needed while cooking)