You can combine fruit with baskets. Generally it will eliminate their weight (especially useful for pumpkins).
Also you can create honey jars by finding a beehive, honey combs and some empty honey glasses. Drop the honeycomb onto the beehive - you will have raw honey lying on the ground. Next step is combining it with an empty honey jar and you get one of the best foods in the game.
I think there are more, just haven found out yet.
