this post was submitted on 22 Oct 2025
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Tomatoes are mildly acidic, so something similar should get you an approximation of the flavor. Pickled onions might be a good choice, or some other lightly pickled fruit/veg (maybe beets for salad). Actual dill pickles are not going to be too acidic to be a good substitute (but are a great thing to put on sandwiches in addition to tomato anyway).
Pineapple might work in some cases, but it has a strong flavor and sweetness that won't work everywhere a tomato does. Salsas are a good place for this as a tomato substitute (along with mango and corn), but pineapple does also work well in some sandwiches.
I support beets as a substitute. Roasted they are sweeter with almost no acidity, while pickled would hit most of the tomato notes.