What can I use as a substitute for lemon juice in cheesecake recipes? My DD is allergic to citrus fruits.?

I've already tried cocoa for chocolate cheesecake but DD is also allergic to chocolate.What can I use as a substitute for lemon juice in cheesecake recipes? My DD is allergic to citrus fruits.?
Wow. Then have DD just eat vegetables because it will be really hard to get the same results if you use a substituteWhat can I use as a substitute for lemon juice in cheesecake recipes? My DD is allergic to citrus fruits.?
You may want to use any kind of flavored extract. There is a lemon extract for the flavor, but you would not use the same amount - maybe only a 1/4 teaspoon instead of 1-2 teaspoons.

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