Onion Tartlets a La Monica

Elevate your appetizer game with these indulgent Onion Tartlets à La Monica—where buttery, flaky pastry meets sweet, caramelized onions and a creamy Gruyère-Parmesan filling. Perfectly portioned for entertaining, these tartlets boast layers of rich flavor thanks to golden onions infused with fresh thyme and a savory custard that bakes to perfection. The homemade crust, made from scratch with chilled butter and a hint of salt, provides the ideal crisp texture to balance the luscious filling. Ready in just over an hour, these elegant bites are perfect for cocktail parties, holiday gatherings, or a sophisticated starter. Serve them warm or at room temperature, and garnish with a sprig of thyme for a stunning presentation. Keywords: caramelized onion tartlets, savory appetizers, gruyere tartlets, party food ideas.

Nutriscore Rating: 62/100

Prep Time:25 mins

Cook Time:50 mins

Total Time:75 mins

Servings: 8

Ingredients

• 1.5 cups All-purpose flour
• 0.5 cup Unsalted butter, chilled and cubed
• 3 tablespoons Ice water
• 2 tablespoons Olive oil
• 4 cups Yellow onions, thinly sliced
• 1 teaspoon Sugar
• 0.5 teaspoon Salt
• 0.25 teaspoon Ground black pepper
• 1 teaspoon Fresh thyme, chopped
• 0.25 cup Heavy cream
• 1 large Egg
• 0.5 cup Gruyère cheese, shredded
• 2 tablespoons Parmesan cheese, grated

Directions

Step 1

In a large mixing bowl, combine the all-purpose flour and a pinch of salt. Cut in the chilled, cubed butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs.

Step 2

Gradually add the ice water, one tablespoon at a time, and mix until the dough comes together. Form the dough into a ball, wrap it in plastic wrap, and refrigerate it for at least 30 minutes.

Step 3

While the dough chills, heat the olive oil in a large skillet over medium heat. Add the thinly sliced yellow onions and cook, stirring frequently, for 15-20 minutes or until they are golden and caramelized.

Step 4

Sprinkle the sugar, salt, and ground black pepper over the onions, stir to combine, and cook for another 2 minutes. Mix in the chopped thyme, then remove the onions from heat and allow them to cool.

Step 5

Preheat your oven to 375°F (190°C). Roll out the chilled dough on a floured surface to about 1/8-inch thickness. Cut the dough into rounds to fit a mini tartlet pan or muffin tin. Press the dough circles into the pan and trim any excess.

Step 6

In a small bowl, whisk together the heavy cream and egg. Stir in the Gruyère and Parmesan cheeses.

Step 7

Fill each tartlet shell with a spoonful of the caramelized onion mixture, then pour the cheese and cream mixture over the top, filling the shells just below the rim.

Step 8

Bake the tartlets in the preheated oven for 20-25 minutes, or until the filling is set and the crust is golden brown.

Step 9

Let the tartlets cool slightly before removing them from the pan. Serve warm or at room temperature, garnished with a sprig of thyme, if desired.

Nutrition Facts

Serving size	1361.6 grams (1361.6g)

Amount per serving	% Daily Value*
Calories	2655

Total Fat 175.40g	225%
Saturated Fat 91.60g	458%
Polyunsaturated Fat 4.60g
Cholesterol 608mg	203%
Sodium 1932mg	84%
Total Carbohydrate 217.50g	79%
Dietary Fiber 18.70g	67%
Total Sugars 38.70g
Protein 55.10g	110%

Vitamin D 66IU	329%
Calcium 913mg	70%
Iron 12mg	64%
Potassium 1505mg	32%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 59.1%

Protein: 8.3%

Carbs: 32.6%