Roast Celeriac Parsnip Soup

3 cups celeriac root (cubed)
3 cups parsnip (chopped)
2 tablespoons olive oil
5 cups vegetable stock
1 bay leaf
1/2 teaspoon salt
1/4 teaspoon black pepper
Garnish: pistou

Preheat the oven to 400 F.

Toss the celeriac and parsnip with the olive oil. Arrange the vegetables in a single layer on a foil-covered baking sheet. Roast them in the preheated oven for 35 to 45 minutes, stirring once, until they are tender and have turned golden brown. Transfer the caramelized vegetables to a large stockpot.

Bring the vegetables, stock, bay leaf, salt, and black pepper to a boil over medium-high heat.

Reduce the heat, and simmer the soup for 15 minutes.

Discard the bay leaf and process the soup in a blender or food processor until it is smooth.

Serve the soup hot, drizzled with pistou as a garnish.

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