½ large spaghetti squash, cut in half and seeded
1 tablespoon butter
1 tablespoon olive oil
1 large leek, trimmed and sliced in half moons
1 cup sliced shiitake mushrooms
4 garlic cloves, minced
¼ cup fresh torn sage leaves
Salt and pepper to taste
Generous pinch nutmeg
¼ cup grated Romano cheese (or Parmesan)