Add fresh lemon juice into a 2-cup glass measuring cup. Add milk, filling to the 1 cup mark.Allow to rest at room temperature for 10-15 minutes, or until curdled. Stir, then use as needed.
Method #2
Add vinegar into a 2-cup glass measuring cup. Add milk, filling to the 1 cup mark.Allow to rest at room temperature for 10-15 minutes, or until curdled. Stir, then use as needed.
Method #3
Combine ingredients in 2-cup glass measuring cup; stir well to combine. Allow to rest at room temperature for 10-15 minutes, or until mixture is curdled. Stir, then use as needed.