Adapted from Vegetarian Cooking for Everyone by Deborah Madison
4 tbsp olive oil;
1 lg onion, diced
1 celeriac
1 bunch turnips
a handful of potatoes
all thinly sliced; Salt and pepper
4 cups bread crumbs
1 cup milk
1 small bunch chopped parsley
3 diced garlic cloves
1/2 c grated parmesan (gruyere or cheddar cheese also work)