2. Drain pot, add 1/4 cup olive oil, rosemary, and 1 chile pieces. Sizzle for 1 minute, shake occasionally. Reduce to medium-low, add 1 cup sliced onion, 1/2 tsp salt, and a pinch of pepper. Cook, stirring often, for 2 minutes until onions soften and turn golden brown (about 5 minutes).