Mashed Potatoes With Celery Root with water

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[...]

3 lbs yukon gold potatoes , peeled and cut into 2-inch pieces 1 lb celery root , peeled and cut into 2-inch pieces 2 garlic cloves , sliced 1 cup light cream[...]

2 tablespoons unsalted butter 4 ounces carrots (parsnips, turnips, or celery root, peeled, carrots or parsnips cut into 1/4-inch-thick half-moons, t) 3/4 lb[...]