Spiced Peppers and Eggplant

Name: Spiced Peppers and Eggplant
Cook time: 30 min
Total time: 30 min
Ingredients: 4 garlic cloves; ¾ tsp. coriander seeds, crushed; ¾ tsp. cumin seeds, crushed; Pinch of saffron threads (optional); 4 sweet peppers, any color (about 1 lb.), cut into 2" strips; 2 baby eggplants (about ½ lb.), quartered lengthwise, or ½ large eggplant, cut into 2x1" pieces; Kosher salt and freshly ground black pepper; 2 Tbsp. red wine vinegar; 1 cup torn fresh basil leaves; 1/4 cup olive oil