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

The Office Fun Run (TV Episode 2007) - IMDb

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

Watch The Office Season 4, Episode 4: Dunder Mifflin Infinity Part 2

The Office: November 2007

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

The Office: November 2007

13 Small Details You Only Notice Rewatching The Office – Page 7

Finale wrap-up: The Office

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

The Office The Deposition (TV Episode 2007) - IMDb

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

Noticed for the first time in S4:E2 Dunder Mifflin Infinity that Michael has his own brand of salad dressing called Great Scott : r/DunderMifflin

You Can Thank Lego For The New Dunder Mifflin Set From 'The Office