"Dipits" -term came from when DS 6 was two and obsessed with dipping things and would ask for "Dip It!!" If you make it about the dip and make a big deal out of having choices, you might have better sucess. My son focuses on the dip choice to the point of not really noticing what he dips in it. His faves include ranch, yogurt, french onion, ketchup (yes, for veggies and fruits, but he loves it), spaghetti sauce, peanut butter, the fruit juice leftover from a jar of fruit cocktail (yes I save this just for this purpose), jelly, cheese whiz, and melted butter. With dinner, we tend to limit how much dip he can have, but when I ask him what he wants for a snack, half the time he asks for a "dipit," so I try to keep a variety of dippable things on hand (green pepper spears, grapes, apples slices, oranges, broccoli, cauliflauer, baby carrots, (and now big, huge carrots b/c "they make a better crunch"), celery sticks, etc... He will eat salad this way, too, dippin each individual leaf into salad dressing like dip...hoping this transitions into eating salad like "a normal person." His favorite thing lately, is to eat apple slices dipped in apple sauce! Cracks me up.
He will also eat almost any green vegetable if he can "put snow on it" (parmesan cheese). He can control the amount now, but I used to put an amount in the cap and let him shake it himself onto the veggies. We would make a big deal over it being a special treat, and he totally bought into it. Again distracted from the "will he or will he not eat the veggies" and made it about "will he or will he not get the parmesan cheese" and just assumed that of course he would eat the veggies.
One more tip-in health class, his kindergarten class made "ice cream sundaes" using yogurt and different things to sprinkle on them like granola, raisins, dried cranberries, nuts, and fresh fruit. He loved the idea of getting to pick what went onto his "sundae." Could maybe do this as a dessert some night and make a big deal over getting to choose which fruits go on the "sundae."