Skim the cream off the top, e.g

• Trim to make leaner, as a steak
• Make "lite"
• Skim the cream
• Do a skimmer's job
• Trim, as a roast
• Make healthier, in a way
• Make lean daughter grilled feta
• Trim on a butcher block

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