The usual stuff really - I got Tamasin Day-Lewis' Kitchen Bible recently (great book, really recommend it) and I was amused to find that her 'storecupboard essentials' list read like an inventory of my kitchen cupboards. I sometimes get fed up with the amount of stuff in our cupboards, but when I look at it I realise that I do use it all on a regular basis and it would be difficult to cut down what we have in there.
My list:
Oils - Olive, sunflower, groundnut, sesame
Vinegars - red wine, white wine, balsamic
Mustards - English, wholegrain, smooth Dijon
Spices/herbs - a pretty extensive range
Flours - plain, self-raising, wholemeal, bread, pasta
Sugars - unrefined caster, light and dark muscovado, icing
Tins - tomatoes, various pulses, fruit in natural juice
Dried - pasta (spaghetti, twists, lasagne), rice (risotto, basmati, brown basmati), bulghar wheat, quinoa, cous cous, chinese noodles, lentils (red and green), muesli, porridge oats, weetabix, nuts (various), fruit (raisins, cranberries, dates, various - depends), tea bags, ground coffee, chocolate (Green & Blacks, natch!), some pretzels or similar, oatcakes,
Spreads etc - sundried tomato paste, pesto, honey, marmite, stock cubes, soy sauce, fish sauce, tamarind paste, raspberry jam, sundried tomatoes in oil, capers, tomato puree, miso paste,
Fridge - eggs, yoghurt, butter, milk, parmesan cheese, cheddar cheese, white wine, tonic water, gin(!), beer
Fruit/veg - always onions, garlic, celery, carrots, salad stuff, bananas, apples and then a whole host of other things, it depends
I'm sure there is masses more, but I feel tragic enough for listing this lot - I'm NOT going to go and check the cupboards