Recipe

A delectable Caramelized Onion Tart with sweet, golden onions and a melty cheese topping—this savory pastry is a crowd-pleaser for any gathering! 

There’s a special charm in the rich, sweet aroma of caramelized onions baked into a flaky tart, elevated by a layer of gooey cheese. This elegant yet simple dish shines as a brunch centerpiece, a sophisticated appetizer, or a cozy dinner side. The Geedel Rotary Cheese Grater makes prep effortless, slicing onions evenly and shredding cheese with precision. Let’s create this irresistible tart!

Ingredients

1 pre-made puff pastry sheet

3 large onions

1 cup grated Gruyère cheese

2 tablespoons olive oil

1 tablespoon butter

1 teaspoon fresh thyme, chopped

½ teaspoon salt

¼ teaspoon black pepper

1 egg (for egg wash)

Instructions

1. Prep the Onions

Peel the onions and cut them in half. Attach the 3-Blade Set to your Geedel Vegetable Chopper and secure it to the countertop with its stable suction base—no slipping or wobbling! Feed the onion halves into the hopper and turn the Z-shaped handle a few times to process them.

2. Caramelize the Onions

Heat olive oil and butter in a large skillet over medium heat. Add the sliced onions, thyme, salt, and pepper. Cook slowly, stirring occasionally, until the onions turn golden brown and sweet, about 20-25 minutes.

3. Grate the Cheese

Switch to the 2-Blade Set on the vegetable slicer. Add the Gruyère cheese block to the hopper and turn the handle effortlessly to shred it into fluffy, fine pieces. The food pusher keeps hands safe, and the detachable handle handles large batches with ease.

4. Assemble the Tart

Preheat your oven to a temperature suitable for baking. Roll out the puff pastry sheet on a lined baking tray. Spread the caramelized onions evenly over the pastry, leaving a border. Sprinkle the grated Gruyère on top. Beat the egg and brush it along the edges for a golden finish.

5. Bake and Serve

Bake until the pastry is puffed and golden, and the cheese is melted and bubbly. Let it cool slightly, then slice into squares or wedges. Serve warm with a fresh salad or enjoy as a standalone treat!

Tips and Variations

Onion Type: Use red onions for a sweeter twist.

Cheese Swap: Try shredded cheddar (use the 2-Blade Set) for a bolder flavor.

Herb Boost: Add rosemary or sage for extra depth.

Nutty Crunch: Sprinkle ground almonds (use the 5-Blade Set) on top before baking.

Storage: Refrigerate leftovers for up to 3 days; reheat in the oven to restore crispness.

Conclusion

This tart blends the sweet richness of caramelized onions with a cheesy, flaky crust that’s hard to resist. The vegetable spiralizer simplifies prep with its versatile blade options—slicing onions and shredding cheese with sharp premium blades for safe, precise results. The stable suction base keeps it steady, while the detachable handle makes batch prep a cinch. Whether it’s a brunch delight or a dinner highlight, this tart brings flavor and elegance to your table!