Self raising flour, fat (marge/butter), salt, pepper, thyme and water.
The ratio should be half the fat to the quantity of flour.
Mix all ingredients to make breadcrumb consistency, then add a drop of water at a time and work it until you have a pastry like dough. Mould into small balls and drop them into the top of the casserole/stew. Make sure there is enough liquid in the pot as they tend to soak up some of the liquid. Simmer for about 15 minutes (depending on size). You can always fish one out and break it open to see if it's completely fluffy and cooked. I use 25% wholemeal flour which makes them more substantial.