Make sure the fruits are not overly wet. Dab them dry by placing them on a kitchen towel and moving them back and forth with your fingers gently. Once done, place the berries into a medium bowl. Drop 1 tablespoon of flour onto the berries. Lift the bowl and shake it to coat the berries with flour. Alternatively, you can place the berries in a ziplock bag and add the flour into it. Shake the bag to coat the berries with flour. Do this gently as you do not want your berries to get squashed.