Acorn, Leached Acorn Flour, Acorn Flatbread, Acorn Stew

I've seen a couple suggestions for acorns as oak sapling replacements and/or for breeding wildlife, but various cultures across the world also use acorns for food. Raw acorns are toxic, so they should give the player Poison status if eaten that way, but that poison can be leached out with enough water. I'll be covering cold leaching in this post because it's both mechanically simpler and preserves the acorn's starches for bread-making.

In real life, cold leaching acorns is a long process that can take a week and a half and dozens of water changes. In Minecraft, I think the most true-to-vanilla simplification would be something like six acorns over a bottom crafting row of three buckets of water to create Leached Acorn Flour in some balanced-feeling multiple of three. The water in the buckets would be used up just like the milk in the cake recipe. I don't think a single water bucket would send the right food safety message.

Leached Acorn Flour could be made into Acorn Flatbread in the same way as Wheat to Bread. Leached Acorn Flour could also be an ingredient in a new stew (exact recipe to be determined, but would probably include mushrooms) and/or incorporated into a rice dish if rice is ever implemented.

In terms of balance, Acorn Flatbread would be an accessible early-game food, nutritionally equivalent to Bread, with the tradeoff of being faster than waiting for wheat to grow, but being more labor-intensive and requiring an iron startup cost.