Butter

A food that gives 0 hunger, but instead gives the Buttery effect for 25 seconds.

With the effect active, you leave a trail of Butter Puddles on the ground. They are slippery and speed you up - making Butter great for accelerating travel on foot.
Butter Puddle
You can exploit Minecraft's questionable slipping physics to make crazy distances and go really fast - especially when using a pre-made trail.

If the ground is occupied by a Short Grass, Dead Bush, Crimson Roots, Warped Roots, Nether Sprouts, or Snow Layer, they become buttery too!

All Butter Puddles and buttery plants' butter will eventually fade away if it's day time. (The speed of the fading is based on the randomTickSpeed)

Clumps of these appear everywhere in the Overworld! (But only on Grass, Dirt, and Sand)
Natural Butterstone drops 2-5 Butterstone blocks (affected by fortune)
It's very quick to break and plentiful, making it a good building block to stockpile.

Natural Butterstone also has a 1/256 (0.39%) chance to drop a Hyper Compressed Butter Clump
You can craft 8 at a time with 4 Butter Sticks in a square , but Butterstone cannot be converted back into Butter Sticks.

Variant of Butterstone crafted with Golden Butter Sticks.
Recipe A: 4 Golden Butter Sticks in a square crafts 8
Recipe B: 1 Gold Nugget surrounded by 8 Butterstone makes crafts 8

A Butter Stick that has 20 durability. 1 is lost on every consumption.

Recipe: 1 Infinity surrounded by 8 Butter Sticks or 8 Golden Butter Sticks.

It also has a 1/256 (0.39%) chance to drop from natural Butterstone blocks.
And a 1/64 (1.6%) chance to drop from Butter Fairies.

Various Butterstone rocks in the Overworld.

A trail of butter.