I have several containers, that steam veggies in the microwave. 2-4 minutes, ya got cooked veg.
One I got from Pampered Chef, One is a WW product. But there are lots of options out there.
Spritz a bit of cooking spray in a non stick or cast iron skillet and fry a banana, these are really good and creamy.
Fruits, such as peaches, apples, apricots, cherries, strawberries, and more, can be home canned. Peaches and apples are super easy to cook down in a crock pot. YOu can do a whole bunch and freeze in individual servings.
Many fruits, fresh squeezed, are easily used to cook with. Lemon, lime, orange, grapefruit, pineapple. Cherries cooked with lean pork is cool. My Dh, picky sob, even liked that. Pineapple and lean ham! Yum!
All fruit jelly, really is not that bad in small doses and can add lots of flavor to many dishes.
Might be a bit off the wall, but check out magazines like "Mother Earth News", "Organic Gardening" and stuff like that. It might not be the food, so much as how it is raised. GMO, Pesticides, commercial fertilizer. Try a veggie or 2 in a good organic/natural soil in a pot and see what happens.
I get that it poses an issue, I also have food allergies, we just have to get creative.
For my allergies, which were many, years ago, most I've outgrown, except for chocolate, and sometimes coffee. I've found, for chocolate, I can tolerate an excellent, high quality dark chocolate, in small doses, and I have found two brands of organic coffee, that taste way good, and don't give me the that crippling belly ache, that sends me to bed with stomach cramps.