Combine the water, tea bag, and lavender buds in a small saucepan over medium-high heat. Bring to a boil, then reduce the heat to medium-low and simmer for 3-4 minutes, until the liquid is slightly reduced and the lavender is fragrant. Strain to remove lavender buds.
In a mug, stir to combine the strained tea, honey, and whiskey. Finish with a squeeze of lemon and garnish with a lemon slice and a few lavender buds.