Gluten Free Rhubarb Crisp Dessert - 1 pound rhubarb, thinly sliced (i used frozen) 2 apples, peeled, cored & sliced (i used granny smith) ⅔ cup sugar zest of 1 lemon 2 tablespoon millet flour 1 tablespoon each of millet flour, tapioca flour, sweet rice flour, brown rice flour, sorghum flour.