This is a delicious and very easy sauce to make. It's also great with ham and all game -- and vanilla ice cream! For the redcurrant jelly I use a bottle (155g) of Staffords Redcurrant Jelly (a British product). It is usually available on the shelf where you find mint jelly and cranberry sauces. It's worth keeping a bottle of good port in your kitchen cupboard, as it's used in so many ways. *NOTE: if you don't have chicken stock powder, use the same amount of chicken broth. PLEASE NOTE: the sweetness of black cherries in syrup can vary a lot from one brand to another, so you'll have to adjust the taste with the lemon juice to prevent the sauce being too sweet.