In a small bowl, mix together the lemon and honey until completely combined. In a small saucepan, put the water, rosemary, ginger and the lemon honey mixture. Heat over medium low until the mixture begins to simmer. Reduce temperature to low and let the flavors meld for about 5 minutes.

Divide among two mugs and top each with 2 ounces of bourbon. Add rosemary and lemon slice to the mugs for garnish if you'd like. Be warmed and enjoy!