Post nerf info: Celebration cakes has been changed to not require apple jam anymore, however you are now going to use your apples or berries directly in the progress. The cakes has been reduced by 40% in income, so you might keep making apples into jam, to sell directly or save the apples for the new process in the recipe.
Although you can use the harvest boost fertilizer, it is much more economical to plant rice+corn (instead of tomato+potato) and then sell the fertilizer. Or you can also just plant rice and fertilize only the rice which is slightly more profitable because of how efficiently rice grows with the speed boost bonus due to it having a harvest time which is divisible by 3.
Thanks so much for the sub. For focus food i make dumpling in parties, I just bring either Oil, meat or spice sprout, you can also use potatoes in this dish, but most bring carrots.