Skin - of chicken! If I buy chicken thighs, I like to deskin them and render them down, i.e. flatten them into a hot frying pan and let their fat ooze out (to fry onions etc). The added bonus is that you get a lovely crisp piece of skin to eat!
Walnuts - a great combination is slices of crusty baguette spread with boursin and eaten with ripe pear and walnuts.
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X AND Z CAN BE OMITTED - so the last letter is Y....and then the alphabet can start again (if there is sufficient interest to do so).