How can I get my parakeets to eat fresh foods?

I have two parakeets who aren't the least bit hand tamed, so any like I have read of pretending you eat it and then offereing it to them will not work. Anyway, I have tried several times with a lot of different foods I tried mixing bits with their seed (I'll get to that in a second) but they eat around it, I have tried to leave the food in the dish all day, but they just walk/poop on it, and I have tried only offering fresh food without seed and they just screamed the whole day. Foods I have tried are Banana, fresh peach, frozen strawberries (thawed), cherries (sans pit), mashed blueberries, seedless g, garden fresh organic corn (I know it's garden fresh and pesticide free because we grow it) (off the cob), canned and fresh green beans, canned peas, peanut er, graham crackers, boiled cabbage, crushed saltines, bits of boiled chicken (cooled). I said I'd get back to the seed thing, I am switching them to pellets as soon as possible, what brand/style do you reccomend? cont.