my kid's current food list - where from here?

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Below I am pasting in the foods my kid can currently tolerate. He seems to react poorly to too much fruit and to other veggies. Unfortunately, the last two times I introduced things, I did so impatiently in casserole dishes, essentially trying three new things at once, which I know is totally evil.Based on this list of foods excellently tolerated, does anyone have a suggestion for the next food to introduce?I know I can just try anything, but I also know there are very wise people on this list with way more knowledge than me, and I also feel having this conversation will get me past my stubborn desire to make fancy dishes.Baden*ProteinsSCD yogurteggsdry curd cottage cheesealmond flour, two slice bread or wee muffin per

daychickenbroiled salmontuna Veggies -Extremely Well Cookedbutternut squashonioncarrotsceleryFatschicken fatscoconut oilolive oilbutterFruitscooked apples (applesauce; baked apples; etc)prunes, stewed 20 minutes (2 in morning, 1 in evening to promote poops)lemon juice from fresh lemonlemon juice from bottle of organic, 100% pure lemon juice (not from concentrate)banana, very ripe (spotted all over)Seasonings - Pure, no sulfites, etcsea saltginger powdernutmegcloves, groundvanillablack pepperSweetenershoneyOtherbaking sodaDrinks - Try to avoid with food. Aim for empty stomach and one hour before a meal.waterapple cider, diluted 50% with waterwelch's 100% grape juice, diluted 50% with waterlemon juice, 100% pure, diluted 50% with water