Caramelize the onions: Heat the oven to 400 degrees (if you have a toaster you can skip this step!). Halve, peel, and thinly slice the onions. Heat a drizzle of oil in a large pan over medium heat. Add the onion and 1 teaspoon sugar to the pan and cook, tossing, for 6-8 minutes, until caramelized. Season with salt and pepper, then set aside.