Heat the 1/4 cup extra-virgin olive oil In a large skillet set over medium-low heat until it's shimmering. Add the 6 medium garlic cloves and 1 large white onion, stir to coat with the oil, and then cover. Cook, stirring often, until the garlic and onion are very soft, about 30 to 40 minutes.☞ TESTER TIP: Keep a close eye on the pan, as the garlic may burn. The moment you see any scorching, tipple in a bit of water, which will cool the pan and prevent burning.