Toast cumin, coriander, and caraway seeds in a small skillet over medium-high heat, shaking skillet 2 to 3 times, until spices are fragrant, about 2 minutes. Transfer to a spice grinder. Cool completely. Grind to a powder. Puree red peppers, chile, garlic, olive oil, lemon juice, and ground spices in blender. Season with salt. Refrigerate up to 5 days.