Caramelized Onion and Gruyère Tart with Fresh Thyme

Appetizer | 4-6 servings (8-10 pieces)

Sweet, deeply caramelized onions meet sharp Gruyère in a buttery tart shell, creating a savory-sweet harmony that resonates with the Gold Rush's honey and oak notes. Fresh thyme adds an herbal lift while the crispy, golden pastry provides textural contrast. This is the kind of showstopping appetizer that makes people linger at the table with cocktail in hand.

Ingredients

• 1 sheet frozen puff pastry, thawed
• 4 large yellow onions, sliced thin
• 3 tablespoons butter
• 2 tablespoons balsamic vinegar
• 1 tablespoon honey
• 2 teaspoons fresh thyme leaves, divided
• 1 cup grated Gruyère cheese
• Salt and black pepper to taste
• 1 egg, beaten (for egg wash)

Instructions

1. Heat butter in a large skillet over medium heat. Add onions, salt, and pepper. Cook, stirring occasionally, for 30-40 minutes until deeply caramelized.
2. Add balsamic vinegar, honey, and 1 teaspoon thyme. Cook for 2 more minutes. Taste and adjust seasoning.
3. Preheat oven to 400°F. Place puff pastry on a baking sheet. Spread caramelized onions evenly over pastry, leaving a 1/2-inch border.
4. Sprinkle Gruyère evenly over onions. Brush border with beaten egg.
5. Bake for 20-25 minutes until golden and crispy. Top with remaining fresh thyme.
6. Cool for 2 minutes, then cut into pieces and serve warm.