If for you, like me, (nearly) a whole summer of warm weather and sunshine means an excuse to be in the kitchen experimenting with ice cream flavours, then no doubt you’ll end up with lots of leftover egg whites. Don’t throw them away – freeze in small plastic bags, labelled with the number of whites, then simply defrost as needed for your recipes (or keep in the fridge for up to a week). I remember once reading Nigella Lawson saying she sometimes separates eggs directly over the sink so she doesn't have the stress of figuring out what to do with all the leftover whites. Nigella, this one is for you.