Make lean?

• Make skim milk
• Trim to make leaner, as a steak
• Trim a steak, for example
• Remove the adipose part
• Trim on a butcher block
• Get the grease out of
• Trim meat, e.g
• Prepare, as chicken stock
• Trim a roast

Wiktionary Word definitions in Wiktionary
vb. To remove fat from a material, especially by the use of solvents