Shredded Beef Burrito Filling. Add a can of diced tomatoes, bring to a simmer and cook for 3 to 5 minutes or until the liquid is slightly reduced. Canned fire-roasted tomatoes—a divinely flavorful shortcut—add a nice waft of smoky flavor, which plays off the punchy notes of garlic and red pepper flakes. Set out the beef in the slow cooker on warm, along with tortillas, bowls of shredded cheese, salsa, sour cream, and chopped lettuce, jalapenos, onions and tomatoes. Make your next office party a taco bar or burrito bar! Stir in baby spinach, top with shredded mozzarella cheese and broil just until the cheese melts. You’ll want to drain excess liquid from a can of fire-roasted This smoky mayonnaise will be your go-to spread this grilling season. Spicy Tomato Aioli Recipe.