Butternut Squash Lasagna Roll Ups

good sized butternut squash

cooked butternut squash for the entire recipe, 2 cups will be for filling mixture, ½ cup will be reserved for the sauce

cup, ricotta

frozen, chopped spinach, measured after it is drained well

grated parmesan

grated asiago

egg

zest of 1 lemon

small garlic clove grated on a microplane

salt and pepper

or 9 cooked lasagna noodles

FOR THE SAUCE

reserved squash pulp, pureed smoother than the pulp for the filling

shallots, or ½ of a white onion, finely diced

stick, unsalted butter

small bunch of sage leaves

stock, I used chicken

cream

grated parmesan

salt and pepper