Impress your guests with these super simple, delicious Roast Beef and mozzarella cheese appetizer sliders.
Heat large nonstick skillet over medium heat until hot. Add flour and vegetable oil; cook for 2 to 3 minutes. Add water and stir until sauce thickens. Add cheese and cook for 1to 2 minutes. Stir in beef.
Put 1/3 cup of meat and cheese mixture on bottom of each bun. Top with 2 tablespoons diced tomato and 1 or 2 dill pickle (if desired). Close sandwiches.