You'll be fine cooking the veggies like that. My cousin has an allergy to all tree born fruits. Breaks out in the same way; swelling of the throat, itchiness all over his body, rashes and hives, etc. Do what you gotta do to get them down. Another option would be to try and buy a green and red powder product which has many of the nutrients from fruits and veggies just in powdered/supplement form.