Ingredients
- 2 medium yellow onions
- 6 tablespoons unsalted butter
- Kosher salt and freshly ground black pepper
- 2 teaspoons sherry vinegar or lemon juice
- 1 pound ground turkey (about 500 grams)
- 1 tablespoon mayonnaise
- 1 garlic clove, minced
- 1 teaspoon Worcestershire sauce
- 2 tablespoons breadcrumbs
- 8 slices rye bread
- 2 cups grated Gruyère or Swiss cheese (about 230 grams)
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