Medium or large zucchini, halved lengthwise, seeds scooped out
Extra virgin olive oil
1 pound ground beef
2 onions, thinly sliced
3 cloves garlic, minced
Fresh basil and oregano, chopped
Brown the ground beef. Remove to a plate. Add a couple of tablespoons of oil to the skillet and saute' the onions and garlic. Stir in the browned ground beef, basil and oregano.
Arrange an oven rack about 7" from the broiler element and heat. Brush the insides of the zucchini with the olive oil and season lightly with salt. Place zucchini cut side up on a foil-lined baking sheet and broil for 5 to 10 minutes. Remove baking sheet from oven and fill each zucchini with enough of the ground beef mixture that it mounds slightly but doesn't spill over the edges of the zucchini. Broil until the zucchini are fork-tender and the tops are lightly browned, 5 to 10 minutes.
Serve immediately with warm marinara sauce and shredded Parmesan cheese.