Heat oil in a medium saucepan over medium heat. Add shallots and cook, stirring, until softened, about 2 minutes. Add grapes, sherry, vinegar, mustard seeds and salt. Bring to a simmer and cook, stirring occasionally, until the grapes have broken down, 10 to 20 minutes.Advertisement
Make Ahead Tip: Cover and refrigerate for up to 1 week.
1 fruit, 1/2 vegetable, 1/2 fat