He'd also like to recreate their queso which he says "was sublime". Lol.

This one doesn't say it's from that restaurant but it does use serranos.

https://mexicanfoodjournal.com/restaurant-salsa/

Was it a green or a red salsa? I buy mine at a Latin market where it is made fresh in house and includes roasted tomatillos and roasted Jalapeños, but Serrano chilies could be used instead, but they are slightly hotter.

Here's one of Pati Jinich's recipes for salsa verde. This is very similar to how I make it when I do make it, but I use less water.

Here's a roasted version.

Thank you both. I'll check your links and pass them on for review. Lars, he said it was red and used fresh serranos. Well blended... Thin. Thin enough that you couldn't get a lot on a chip. That's the best he remembers it now. He'd also love a recipe like their queso. He said the restaurant was in a very poor section of downtown Dallas, and authentic Mexican (not a chain).

ETA:

cookebook, that recipe looks right! He'll definitely try it when he can get the ingredients.

Lars, that tomatillo recipe looks great. I can grow decent tomatillos here because they can tolerate light frosts, but I just wing my own salsa verde. I'll definitely try that salsa verde recipe when I can.

cookebook, my friend wanted me to thank you again. He thinks that recipe has the trick because he said he tried making a version with both fresh tomatoes and canned tomatoes but neither was right. He's so excited that he's trying to justify going grocery shopping to look for the ingredients! :p

Wonderful! I hope he likes it!

The only thing I did in Guadalajara was change trains or change planes.

He said this Guadalajara's had a mariachi band. I'd go for a frozen margarita. :)

Mariachis are from Jalisco/Guadalajara, but lots of Mexican restaurants have them. :)

Not in the northeast. lol!

You can hire mariachis at Grand Central Market in downtown L.A. and also at certain plazas in Mexico City. There are a lot of people from Guadalajara in Los Angeles.

Thank you for the video, Lars! That was fun!