What is Rye Flour (Stoneground)?. Why Should I Get 100% Rye Flour (Stoneground)?. What's In My 100% Rye Flour (Stoneground)?. Rye flour contains enough gluten to make a yeasted loaf on its own, and tends to produce dense, dark, richly flavoured bread; The flour's intensely fruity flavour is delicious incorporated into fruited cakes and sweet quick breads, such as scones.