Toss cherry tomatoes with olive oil and 4 chopped garlic cloves, then roast mixture in oven at 400° until browned (about 45 min.). When cool, puree in a blender or food processor.
Sauté chopped onion in a stew pot with 2 tablespoons of olive oil. When onions are soft, add tomato puree and the berbere spice. (The berbere is spicy, so start with a small amount. You can add more later.) If this mixture is too thick, it can be thinned by adding a small amount of water.
Add lamb and simmer until meat is tender (about 90 min.). Sample for spiciness and add more berbere, to taste. Add in roasted squash pieces and peas. Mix well.
When ready to serve, lightly sauté zucchini spirals with remaining 4 chopped garlic cloves. Serve the stew on top of zucchini and garnish with pomegranate seeds.