Half the peaches and discard the pits, keep the skin on. Place the halved peaches in an oven-proof dish.
Mix the wine, water, and honey (or date or maple syrup if substituting.) Pour the wine mixture over the peaches. Scatter the lavender on top. Place in the oven and bake for 20 minutes.
Remove from the oven, baste then bake for a further 10-20 minutes until the fruit is just tender.