Mushroom, Onion, And Spinach Sandwich - cooking recipe

Ingredients

1 large onion
12 ounces fresh sliced white mushrooms
1 garlic clove
1 1/2 tablespoons olive oil
salt and pepper, to tase
6 slices whole wheat bread
mustard
mayonnaise
2 1/2 cups fresh spinach
1 tablespoon balsamic vinegar
1 1/2 cups mozzarella cheese

Preparation

1. Chop onion and mince garlic.
2. Heat oil in large frying pan and add onion, garlic, and mushrooms. Season with salt and pepper to taste. Saute until soft.
3. Meanwhile, toast bread and spread mayonnaise and mustard on toasted bread slices.
4. Remove pan from heat and add spinach and balsamic vinegar to pan. Stir until spinach wilts.
5. Divide sauteed mixture evenly onto three slices of bread. Evenly divide cheese onto each of these slices of bread (on top of mushroom mixture). Top with the remaining slices of bread.