Zucchini Lasagna With Ground Beef

INGREDIENTS

20 oz

zucchini (about 2 large) ends sliced off and discarded

1 lb

extra lean ground beef

15 oz

can tomato sauce or puree

1 cup

finely chopped onion (about 1 small)

1 1/2 cups

shredded mozzarella cheese

1/2 cup

finely grated parmesan cheese

2 tbsp

olive oil

3 tsp

dried oregano

2 tsp

salt

etc