1 acorn squash
1 tablespoon butter or olive oil
1 leek, sliced (only white and pale green parts
2 cloves garlic, minced
1 tablespoon dry vermouth (substituting white wine or water is fine)
1/2 cup low sodium vegetable broth
1 bunch fava greens, leaves removed stalks
1/4 cup shredded Parmesan cheese