Melt 250 gram of butter in a pan. Stir in 4 tubs of Greek yogurt. Add some something to give a bit of substance if you wish. Sometimes I crush up Macadamia nuts, others times I add oats. Make sure it is all is blended nicely. Pour a small amount, similar to a gel amount, say 50 grams into a plastic sandwich bag and tie a very firm knot in the top. When you want to use them, just grab one of the two corners in your teeth and bite it off, then suck/squeeze the mixture out. Always dispose of the cling film and plastic bags appropriately