In The Office episode 'Dunder Mifflin Infinity' Michael has his homemade salad dressing on his desk, Great Scott. Referenced in a deleted scene from the previous episode 'Fun Run'. : r/TVDetails

Watch The Office Season 4, Episode 3: Dunder Mifflin Infinity Part 1

The Office' 15th anniversary: Where are Dunder Mifflin employees now?

The Office Dunder Mifflin Infinity (TV Episode 2007) - IMDb

What the hell is this bottle? Does Michael make his own salad dressing and put his own face on the bottle? : r/DunderMifflin

The Office creator explains why the show won't be revived anytime soon

Watch The Office Season 4, Episode 3: Dunder Mifflin Infinity Part 1

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use

In a deleted scene from Fun Run (link in comments), Michael mentions that he makes and sells his own salad dressing by combining Newman's Own Ranch with Newman's Own Italian. In the next episode, there's a jar of it sitting on his desk. : r/DunderMifflin

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use

Great Scott salad dressing : r/DunderMifflin

The Office Launch Party (TV Episode 2007) - IMDb

Watch The Office: Superfan Episodes Season 4, Episode 4: Dunder Mifflin Infinity Part 2 (Extended Cut)