Potato and Caramelized Onion Gratin

Name: Potato and Caramelized Onion Gratin
Prep time: 30 min
Cook time: 50 min
Total time: 1 h 20 min
Yield: 12 serving(s)
Ingredients: 2 Spanish onions, diced; ¼ cup (55 g) butter; ½ cup (125 ml) white wine; 1 tbsp (15 ml) tomato paste; Salt and pepper; 11 cups (1.7 kg) peeled and cubed potatoes; ¼ cup (55 g) cold butter, cubed; ½ cup (125 ml) 35% heavy cream; ½ lb (225 g) firm washed-rind cheese, sliced; 2 tbsp chopped fresh chives

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Preparation 30 MIN

Cooking 50 MIN
Servings 12

Timing an elaborate meal is tricky, but we have a tasty cheat for mashed potatoes: Transform them into a gratin by spreading caramelized onions over them and topping with cheese. Prepare the day before and slide into the oven for a few minutes before serving. Our prediction? This super side dish will steal the spotlight.

Ingredients
Preparation

Ingredients

Caramelized Onion

2 Spanish onions, diced
¼ cup (55 g) butter
½ cup (125 ml) white wine
1 tbsp (15 ml) tomato paste
Salt and pepper

Mashed Potatoes

11 cups (1.7 kg) peeled and cubed potatoes
¼ cup (55 g) cold butter, cubed
½ cup (125 ml) 35% heavy cream
½ lb (225 g) firm washed-rind cheese, sliced
2 tbsp chopped fresh chives

Preparation

Caramelized Onion

With the rack in the middle position, preheat the oven to 400°F (200°C).
In a large skillet over medium heat, soften the onions in the butter, stirring frequently, for about 20 minutes or until they begin to caramelize.
Add the wine and tomato paste. Continue cooking, while stirring, until the wine has completely evaporated. Season with salt and pepper. Transfer to a 12-inch (30 cm) round baking dish.

Mashed Potatoes

Meanwhile, in a large pot of salted boiling water, cook the potatoes until very tender. Drain. With a potato masher, purée with the butter until smooth. Stir in the cream. Season with salt and pepper. Spread over the onions. Top with the cheese.
Bake for 20 minutes. Finish under the broiler for 3 to 5 minutes or until the cheese is lightly golden brown. Let rest for 10 minutes. When ready to serve, sprinkle with the chives.

Note

This dish can be made the day before. In this case, bake the gratin for about 40 minutes so that it’s piping hot.

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