Onion Gruyere Tart | Edible Bozeman

Ingredients

• 1 cup raw honey
• 1 teaspoon red pepper flakes
• 1 cup balsamic vinegar
• 3–4 tablespoons hot honey
• 3–4 tablespoons balsamic glaze
• 1–2 teaspoons thyme, rosemary, or sage
• 1 medium yellow onion, thinly sliced
• 9 slices gruyere cheese (from a 2½-inch square block)
• 1 sheet puff pastry, thawed
• 1 egg