Got a tip from a coworker and was in M yesterday so I went by.
My one claim to fame on CH is TECC, which I posted about when they were simply El Charro, with Jose and his Dad in the wagon across from Ft. Myer. El Molino rivals if not surpasses TECC, though it's a different style, so, there's that.
Small place but with a good double handful of tables. I sat at one of about two stools DIRECTLY across from the grill where the women were slaving over the hot grill on a hot day. Any AC was lost to the outside due to the never-ending lines. I was the only non-hispanic the whole time I was there, btw.
They have a few other things on the menu but I was told to stick to tacos only, which I did. Inside secret on ordering comes later...
Next thing to mention is that they make their own tortillas there, with the press directly behind where you place your order. They sell them fresh to go as well. And to tell you again how busy the place is, the grill person for tortillas just kept her part of the grill full, with no regard to orders coming in. What they do with the extras is to turn them into tortilla chips served communally near the register where you take a few with some tongs, put them on a plate, and go back to your seat.
The tortillas are about the size of silver dollar pancakes, so the tacos are slightly small and the chips slightly large. White corn. The tacos are made with two of these, slightly offset, with radish, cilantro and onion. There's a tiny little toppings bar with two red and one green salsa that are slightly warmed. Also, more radish, cilantro, onion and....beets. I think that's what they were, anyway (not much of a beet fan, and I wanted to get the straight dope first time out).
So, onto the main show (secret still to come). I got 2 barbacoa and 3 al pastor tacos. I think they cook everything on the grill, and it seems that they may ever-so-slightly pre-cook some or all meats (probably due to the demand). The barbacoa was awesome. Perfect amount of fat and elasticity making it juicy with a nicely seared exterior. Good size chunks. I have to make a stretch to say the only thing that was sub-par was that the al pastor was diced very small, but it still did retain flavor - just not as much as the barbacoa. Lengua, pollo, carne and carnitas were other offerings. No chorizo, and this is one place where the pollo may actually be something I'd like (since they at least finish it on the grill).
So, if you walk in and refer to the menu above the register, most tacos are priced at $2. Some a bit more. I was told to ask for the "cinco taco especial". The two meats I chose were both priced at the $2/taco level. Well, the special then re-prices them at $1 each. 5 tacos for $5. And there isn't skimping, there was meat that couldn't fit into each taco AND the toppings provided were more than could fit into the tacos as well.
I tried one red sauce (presumably the hot b/c it was) and the green, which was also spicy. The other red looked the same as the first, but I didn't try it either way.
I'd still be hard pressed to drive to Manassas just for this, but heck if I'm ever near there or even passing by on 66 during operating hours, this is a place I'm sure to stop at.
Did a search on the board and couldn't find anything, but if anyone else has experience with the place I'm all ears. And of course, there are so many other places in Manassas, though many are very honest in advertising that they are Salvadorean.