Seared Tuna Sandwich With Balsamic Onions

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Ingredients

2 teaspoons butter

2 cups vertically sliced onion

1 1/2 tablespoons balsamic vinegar

1/4 teaspoon dried thyme

1 tablespoon all-purpose flour

1/2 teaspoon salt

1/4 teaspoon garlic powder

1/4 teaspoon black pepper

4 (6-ounce) tuna steaks (about1/2 inch thick)

Cooking spray

4 teaspoons Dijon mustard

4 (2-ounce) whole wheat hamburger buns

4 curly leaf lettuce leaves

4 (1/4-inch-thick) slices tomato

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