Pre heat oven to 350o. Spray non fat Pam on bottom and sides of oblong
casserole dish. Cut and clean vegetables so they will be ready as you
assemble the casserole. Slice up cheese and put aside.
Boil celery root and potatoes in large pot of water until soft . Drain
water, layer in bottom of casserole 1/2 the celery and potatoes. Cover with
all the sliced tomatoes.
Saute onions and garlic. While still slightly crunchy, layer all the onion
mixture over potatoes and tomatoes in casserole.
Sprinkle half the ementhal, gruyere and goat cheese evenly across top of
onion mixture.
Make white sauce. Melt butter, whisk in flour, mix until creamy, while
stirring pour in milk whisk until creamy with no lumps as sauce thickens.
Season as needed. (Sometimes I add fresh herbs from my garden: choose one
or a mixture of all - parsley, sage, rosemary, lavender, salt pepper)
Add parmesean cheese to white sauce, stir to keep from getting lumpy. Pour
all of sauce over top layer of cheese. Then repeat layers with potatoes and
celery root, and the rest of the cheese.
Bake at 350° for 45 min. to 1 hour. Casserole should stay
creamy while potatoes get a crunchy top.