Combine the shallots, garlic, rosemary, salt, and pepper in a small saucepan, place over high heat, and cook for 30 seconds. Add the stock and bring to a boil. Reduce the heat and simmer for 6 minutes. Remove from the heat. Serve immediately or store, refrigerated, in an airtight container for up to 2 days. Reheat in a small saucepan over lowest heat.
Yield: about 1 cup