Total time: 25 minutes
In a cheesecloth pouch, tie rosemary, lemon thyme, lavender, if using, and peppercorns together. (Alternatively, put them directly into the liquid and remove before serving.) Add remaining ingredients and 1/2 cup water to a large pot and bring to a simmer over medium-high heat. Turn off heat and let infuse for 10 minutes; remove herbs and spices. Serve warm in heatproof mugs or glasses.