Method:
Cut each zucchini in half both ways to make 4 pieces from each squash. Parboil zucchini by boiling in water for about 5 minutes. Hollow out zucchini using a teaspoon to scrape out seeded area and create "boats." Set aside.
Melt butter in a skillet and sauté onion until translucent, about 5 minutes. Add chili powder, salt, garlic, and cumin. Stir and cook about 3 minutes.
In a bowl, combine onion/spice mixture with bread crumbs and Parmesan cheese. Stuff zucchini boats with bread crumb/onion mixture. Bake at 350°F for 15 minutes until breadcrumb stuffing browns on top.
Prepare sauce: process vinegar, garlic and olive oil in a blender or food processor until smooth. Combine in a large bowl with vegetables, purée and lemon juice. Season to taste with salt, pepper and Tabasco (if desired).
Serve your boats "floating" on the gazpacho sauce in individual wide, shallow soup plates.