Hamburger Stew with Potatoes

Name: Hamburger Stew with Potatoes
Ingredients: 1 pound ground beef; 3 cups water; 2 (8 ounce) cans tomato sauce; 4 medium potatoes, peeled and chopped; 2 medium tomatoes, chopped, or more to taste; 0.25 cup chopped white onion; 1 (1.41 ounce) package sazon seasoning (such as Goya®); 2 cubes beef bouillon; 1 clove garlic, minced, or more to taste; 0.5 teaspoon chili powder; 0.5 teaspoon ground cayenne pepper, or to taste; 1 large bay leaf; ground black pepper to taste; 4 ounces frozen mixed vegetables (such as Birds Eye®)