Waffle Sandwich with Cheese, Spinach and Spicy Mustard

By Desiree Howell

5.0 / 5

15min

5min

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1 Roma (plum) tomato thinly sliced
salt and ground black pepper to taste
2 teaspoons butter softened
4 pieces thickly-sliced multigrain bread
1 teaspoon spicy brown mustard
1 cup fresh spinach or to taste
4 slices part-skim mozzarella cheese
2 teaspoons chopped sweet onion