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Upside-Down Onion and Gruyère Tarts

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Flaky puff pastry topped with caramelized onions, nutty Gruyère cheese, thyme, and a drizzle of honey for a sweet-savory tart that works as an appetizer, brunch dish, or light dinner.

Ingredients

1 sheet puff pastry, thawed

1 yellow onion, thinly sliced

3 tablespoons honey or hot honey, divided

Fresh thyme leaves, to taste

Salt and freshly ground black pepper, to taste

18 slices thinly sliced Gruyère cheese (or as needed)

1 egg, beaten

Instructions

  1. Preheat oven to 400°F (200°C) or as directed on puff pastry package. Roll out pastry slightly on its parchment backing to smooth creases.
  2. In a skillet over medium heat, sauté sliced onion until golden and translucent. Stir in 2 tablespoons honey (or hot honey) and cook 1–2 minutes more until lightly caramelized. Season with thyme, salt, and pepper.
  3. Spread onion mixture evenly over puff pastry, leaving a 1/2-inch border around the edges.
  4. Layer Gruyère slices evenly on top of the onions.
  5. Fold pastry edges up to create a rustic border. Brush edges with beaten egg.
  6. Bake 15–20 minutes, until pastry is puffed and golden brown.
  7. Drizzle remaining 1 tablespoon honey over tart. Cool slightly before slicing into 6–8 pieces.

Notes

Swap Gruyère with fontina, smoked mozzarella, or sharp cheddar.

Try red onions for a sharper sweetness.

Experiment with rosemary or tarragon instead of thyme.

Add toasted nuts for extra texture.

Use hot honey for a spicy-sweet kick.

Nutrition

Find it online: https://justsosavory.com/upside-down-onion-and-gruyere-tarts/