So right now, there is no incentive to actually cook any of the complex food items except for the novelty of doing something different or to unlock the recipe in your list; with or without cooking pot upgrades, it's more efficient to just cook raw meat or fish in terms of energy gain per slot in the food pot; this has been a thing constantly brought up, and I think complex recipes of all colors should yield more than one item to make up for the space they take to process as has also been suggested before-- but that isn't what this suggestion is really about.
In order to give the green-tier (and i suppose purple tier if we want to be fancy) complex recipes some tangible use, I suggest opening up more farming options for Bigs/Tiny to watch your compost for more variable amounts of time (6 hours? 24 hours for purple tier recipes?) for green-tier food items like jam and yogurt-- I suggest also always having all "tiers" (a green, a blue, and a purple) of food option suggestions available, so people can choose if they want their farm to be monitored for 6/12/24 hours.
Ideally I suppose you could make the argument for using 3-4 green tier items, keep the 2-3 blue tier foods for the current conditions, and then 1-2 purple tier items for some semblance of balance? Though I'd personally be in favor of just keeping a 1-2 ratio for everything, since most of the farmed food can't even really be cooked yet.