For a milder flavor that might appeal to picky eaters, you can reduce the amount of red wine vinegar and increase the water in the marinade. If you can’t find juniper berries, they can be omitted or substituted with a small amount of gin. To make the dish gluten-free, you can thicken the sauce with cornstarch instead of gingersnap cookies. Simply mix 1-2 tablespoons of cornstarch with cold water and stir it into the simmering sauce until thickened.