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“Mad Men” and “30 Rock” have deep ties. The most notable is “Mad Men” star Jon Hamm also having a recurring role on “30 Rock” as one of Liz Lemon’s love interests, but there’s more — and this past Sunday was the most subtle one yet.

Ted Chaough, a rival to Hamm’s Don Draper, placed an order on Sunday’s “Mad Men” for an Old Spanish. That’s not a real drink — or at least it wasn’t until “30 Rock” character Cooter Burger, played by Matthew Broderick, placed an order for the ridiculous drink that consists of red wine with tonic water and olives in it.

“30 Rock” writer Tracey Wigfield caught the apparent shoutout:

Best thing ever: on MadMen last night Ted ordered an Old Spanish, a made-up drink from 30 Rock. Red wine, tonic water & olives for everyone! — Tracey Wigfield (@TraceyWigfield) April 22, 2013

The relevant episodes aren’t available to watch for free online, but Uproxx provides a nice summary in graphic form of how Burger learns that an Old Spanish is not, in fact, a thing.

I guess Burger wasn’t the original creator of the drink — it was apparently available to order by the swinging ’60s.

It's long been a one-way love affair, with "30 Rock" referencing "Mad Men," but now the love seems to be going both ways.

Another “Mad Men” star, John Slattery, dropped in on “30 Rock” in the past as a crazed wannabe political candidate. Tina Fey’s Liz Lemon’s mom also mentioned working at “Mad Men” ad firm Sterling-Cooper, telling her daughter in one episode, “It wasn’t that simple, Liz. I had just graduated from secretarial school and I got a job at Sterling-Cooper.”

You can watch the series finale of “30 Rock” below, which includes another “Mad Men” reference — Liz Lemon asks Jack Donaghy, “Don’t you want to know how ‘Mad Men’ ends?”

(Hat Tip: Huffington Post)