tip: apex of tongue, most anterior part blade: lies right in back of the alveolar ridge dorsum (body): main mass of tongue in front of the root root: most dorsal part of tongue.
Bring milk, water and celery root to a simmer in a large saucepan over medium heat. Reduce the heat to maintain a gentle simmer and cook until very tender, about 30 minutes. Reserve 1 cup of the cooking liquid, then drain. Puree the celery root, butter, salt and pepper in a food processor (or blender) until smooth and the consistency of thinned mashed potatoes.
1 Bring a large pot of salted water to a simmer (1 Tbsp of salt for every 2 quarts of water) while you peel the celery roots with a knife. Cut the celery roots into 1-inch pieces and boil for 25-30 minutes, until soft. . 2 Drain the celery roots, return them to the pot to the stovetop on low. Let the celery roots steam for a minute or to, shaking the pan a bit to prevent sticking. 3 Add the milk or cream, butter and a generous pinch of salt and mash with a potato masher until it is as smooth as you like it. Add salt to taste and garnish with the celery root leaves, if using.