Caramelized Onion and Goat Cheese Toasts

This recipe is written for 5 lb (2.3 kg) of onions because that is a standard unit for a bag of onions, but caramelizing can be made with any amount of onions you have on hand. I generally caramelize onions in huge batches and use the food processor slicing blade to make quick work of getting the onion into slices. In general, the onions reduce to about one-fourth of their original volume. Read: if you start with 4 cups (640 g) of onions, expect to get about 1 cup (195 g) of caramelized oni