How to diminish bitter/sour/spicy taste in food?

Mix one ingredient of each together, and they surprisingly balance each other out.

I pureed zucchini, radish, and yellow plum (each small sized), resulting in a sharp, but refreshing taste. Like eating something that doesn't really taste great, but it is so unique that it keeps you coming back for another bite. The flavors might be considered a "palate cleanser"?

The babies were OK with it, then during the second introduction took to it very well.