It's the acid that is needed in many recipes calling for lemon juice.
You can often substitute vinegar for citrus, but will have to try the
recipe to be sure it works!

"elizabeth emerald" > wrote in message >...
> my son is allergic to citrus (among other things) & i am trying to find
> something to replace lemon/citrus juice & rind in recipes. it is an
> important ingredient in so many recipes both savoury & sweet.
>
> any ideas?