Mashed Potatoes with clove

3 lbs new potatoes (about 8) 1 lb celery root (about 2) 3 garlic cloves , minced 1/2 cup butter 1/4 cup milk 1/4 cup parmesan cheese , grated 1 teaspoon salt[...]

1/2 lb celery root , peeled and cut into 1-inch chunks 1 large baking potato , peeled and cut in half 1 garlic clove , peeled 2 tablespoons milk 1 tablespoon[...]