Greetings.
I am a man in a suit who has fallen into the world of Minecraft.
This time, I am building a cow pasture in the castle town with a button-operated semi-automatic processing chamber beside it.
I will send one cow inside and test whether I can obtain leather and cooked beef.

Building a cow pasture and semi-automatic processing chamber
The finished cow farm combines a fenced pasture with a stone processing chamber.

On the side where a cow enters, I place an iron trapdoor and add a lever that opens the drop into the chamber.

Below the opening is a processing chamber that I can watch through glass.

I place a lava-filled dispenser in the wall and connect it to an outside button with redstone.

With one button press, lava appears briefly, and the dispenser on the opposite side automatically collects it again.
The lava does not keep flowing. This is a semi-automatic machine that still needs me to operate it.
Sending in one cow and obtaining leather and cooked beef
Once the cows are in the pasture, I hold wheat and lead one toward the processing chamber.

When I open the iron trapdoor, the cow enters the chamber below.

I press the outside button. The lava appears briefly, sets the cow on fire, and is collected again.
After waiting a little while, leather and cooked beef fall onto the chamber floor.

During this run, the items land beside the hopper row, so I pick them up by hand.
My inventory shows that this one cow gave me one leather and two pieces of cooked beef.

Minecraft’s official cow article explains that cows drop leather and raw beef.
In the Java Edition 1.21.11 game data, a cow can drop zero to two leather and one to three raw beef, with the beef being cooked when the cow is on fire.
The one leather and two cooked beef are the result of this run. A cow does not always drop leather.
Covering the floor with hoppers and improving the collection path
After the main run, I add another hopper beneath the floor position where the items missed the original row.
The whole chamber floor is now covered by hoppers, with a lower hopper leading into the collection chest.

Minecraft’s official hopper guide explains that a hopper can collect items falling from above and transfer them into a connected container.
After the change, I separately place cooked beef on the newly covered adjacent floor position and confirm that it travels through the hoppers into the chest.
I do not repeat the complete sequence from processing a cow through automatic collection, but the collection path now covers the place where the items landed.
The castle town now has a cow pasture and a button-operated semi-automatic processing chamber.
I will keep raising cows here while preparing leather and food little by little.
That is all for this time.
Greetings.