Which books should I look for on making these items? thanks
Salad Dressings, Ketchups, Mustards, Onion Dips etc...
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I like Helen Witty for this sort of thing. Probably the best of her books is The Good Stuff. It includes most of her earlier work Fancy Pantry plus plenty more.
Also of note is her Better than Store Bought.
Joy of Cooking will also cover much of this territory and quite well. I'm quite fond of the onion dip in Joy of Cooking.