1 medium butternut squash (about 2 to 2 1/2 pounds), peeled, seeded, and cut into 1 1/2-inch pieces
1 medium garlic clove, minced or pressed
1/2 teaspoons ground allspice (I skip this)
2 tablespoons olive oil
Salt
One 15-ounce can chickpeas, drained and rinsed (1 1/2 cups)
1/4 of a medium red onion, finely chopped
1/4 cup coarsely chopped fresh cilantro or parsley

For tahini dressing:
1 medium garlic clove, finely minced with a pinch of salt
1/4 cup lemon juice
3 tablespoons well-stirred tahini
2 tablespoons water
2 tablespoons olive oil, plus more to taste