How to Get Large Milk in Stardew Valley
Large Milk is the larger and more valuable version of the standard-sized milk produced by your cows. The large milk also has different quality ratings associated with it just like most items in the game. Using large milk in the cheese press will produce gold quality cheese, thus, making it more valuable when sold.
How to Get Large Milk
To get Large Milk in Stardew Valley you must feed your cows daily and also interact with them daily. This will get their friendship up allowing them to produce large milk as well as higher quality milk. Letting your cows graze outside will also slowly raise their friendship level.
When your cows' friendship is high enough, milking your cow will yield you large milk.