For the best flavor, sauté garlic in olive oil over medium heat until fragrant but not browned. This will release the garlic’s aroma into the oil, creating a flavorful base for the sauce. As the garlic softens in the oil, it releases its natural oils, creating a fragrant base that infuses the entire sauce with its rich, savory flavor. This is crucial in arrabbiata, where garlic is a key ingredient.