I'd love to see milk, salt, pepper, and other similar vital ingredients to recipes be added to the abundant activities shop and be less extremely expensive. I think tossing them in there (or explore, maybe in one of the low zones like how you can get dyes in the arctic town) so cooking is more viable for everyone.
Currently they're only available in very small random quantities from the mole market and it means they're 1ms apiece on the trading post... not really what you want to spend on some mid-level recipes ^^;;
I wouldn't cry to see cotton seeds in there either as so many recipes need cotton.
Updates with additional suggestions:
Sugar/Sugar Cane