Salsa Borracha 

onion, half blended half chopped at the end

 To a large skillet on medium high heat, add the oil, once hot, add the tomatoes, serranos & half the onion. Cool for 5-7 minutes or until some of the veggies are getting browned.

 Add in the garlic, cook for 4-5 more minutes, then some Chiles de Arbol and cook for another 4-5 minutes.

 Add in half the can of beer, let it cook/simmer for 5 minutes.

 Let the mixture cool down slightly before adding to a blender or food processor. Add the salt & blend until combined, try to leave it slightly chunky still.

 Pour the salsa into a bowl, then mix in the remaining chopped onion, cilantro, about another 1/4 cup of the beer and the juice of one lime. Stir to combine and adjust seasonings if needed.