Pour the oil into a small, screw-top jar and add the chilli peppers, bay leaf and lemon rind. Screw on the top and shake. Leave to stand in a warm place for at least 24 hours before use. It will keep at room temperature indefinitely. Ready made piri-piri can be bought by the portuguese, who use it a good deal as a spicy condiment on pasta, fish or meat and also to flavour stews. From "THE WORLD'S BEST FOOD FOR HEALTH AND LONG LIFE" by Michael Bateman, Caroline Conran & Oliver Gillie. Published in 1981 by Houghton Mifflin Company. Shared by Robert Rostrup