The inclusion of herbs, spices, lemon and lime zest will infuse fresh and interesting flavours to food negating the need to add any processed ingredients, salt or sugar, which means keeping food low fat and healthy. Home made concentrated stock will also add flavour to food. For example, I will use dried porcini to add flavour. I will soak the porcini in a small amount of water, bring it to the boil and simmer until a concentrate develops.