Family-Style Coquille St. Jacques

Instructions

1. 1

   Place the potatoes and celeriac cubes in a large pot. Cover with cold water and season with salt. Bring to a boil. Simmer for 20 minutes or until the vegetables are tender. Drain and return to the pot. Over medium heat, dry out the vegetables for 2 minutes while stirring with a wooden spoon.

2. 2

   In a food processor, purée the vegetables with the butter until smooth. Use a spatula to scrape down the sides of the food processor as needed. Season with salt and pepper. Transfer the purée into a pastry bag fitted with a ½-inch (1 cm) star tip. Set aside.

3. 3

   With the rack in the middle position, preheat the oven to 425°F (220°C).