Tzatziki (the Greek cucumber salad): Greek style yoghurt (the thick kind, with 10% fat), grated cucumber (moisture pressed out through a seeve), dill, parsley and garlic. Mix together and enjoy (with falafel for example).
Egg salade: boiled eggs, chopped chives, little salt and pepper, few spoons of mayonaise. Voilà, homemade preservative-free egg salade. Nice on a sandwich.
Chocolate milk (handy for the lactose intolerant): 2 teaspoons of cocoa (the pure kind, not the instant stuff), half a teaspoon of sugar or honey, dash of lactosefree (nut)milk. Now stirr this thoroughly so al the cocoa is mixed with the milk. Fill mug further with milk and heat it in the microwave or on the stove if you like.
Lactosefree butter, aka ghee or clarified butter: heat full fat butter till the foam starts browning, than pour the melted butter through a coffee filter into a jar. Keep jar in the fridge and it will last a very long time (a year maybe?).
Pectin juice, to thicken jams and jellies that contain little natural pectin: I use apple peals and cores and/or the white part of citrus peels. A great way to use up the waste materials of making an apple pie or orange juice for instance. Also a way to use any apples fallen off early (more pectin in unripe apples!).