01 - Bring 2 cups of water to a boil using a kettle or small saucepan.
02 - Place the peppermint leaves into a teapot or heatproof pitcher.
03 - Pour the boiling water over the peppermint leaves, cover, and steep for 5 minutes.
04 - Strain the infusion into cups using a fine-mesh strainer.
05 - Sweeten with honey or agave syrup if desired, and add lemon slices. Serve hot or chilled over ice.