A random thing I've been doing lately to reduce my waste – I keep any and all vegetable scraps in a bag in my freezer. Whenever I've collected enough, I boil them all up into vegetable stock to use in cooking, to give plenty of that sweet, sweet umami flavour.
All kinds of scraps go in the bag. Carrot peel. Onion skin. That one mushroom which always starts to go dry before I can use it. The only rules are to make sure everything's clean, and to avoid using anything which is rotten or mouldy.
@knightly @InvaderXan @Torie I think actual composting is a pretty effective use of vegetable scraps, though of course you can compost them after making soup stock too. Fertile soil is a precious resource, which we are losing steadily now that we don't let rivers flood farmers' fields. Or (this is the Netherlands) use land expansion techniques based on ocean silt collection.
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