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You won't find freezers, can openers, or microwave ovens at this national Mexican food chain. Since 1990 Baja Fresh has been serving up great food, made fresh with each order. As you're waiting for your food to come out, that's when you hit up the salsa bar, where you'll find several varieties of delicious fresh salsa, from hot to mild, ready to be spooned into little tubs that you can take to your table or to your car. One of the most popular selections is called Salsa Baja—its medium spiciness, smoky flavor, and deep black color make the salsa unique and mysterious. That is, until now, since I've got a Top Secret formula for you right here. But the recipe wasn't as easy to create as I first thought. I figured the tomatoes would have to be extremely blackened over a hot grill, but I wasn't sure how to get them dark enough to turn the salsa black without the tomatoes getting all mushy and falling apart on the barbecue.
So, I went back to Baja Fresh before they opened to peer through the window to see if I could catch some hot salsa production action. I waited and waited. After several hours as the lunch rush was beginning to wind down and no fresh salsa was in the pipeline, it was time for extreme measures to get things moving. I went in and ordered 30 tubs of Salsa Baja to go, and that did it. I ended up with a big bag filled with 2 gallons of salsa (thankfully they poured those 8-ounce portions into bigger bowls), and the restaurant went immediately into "salsa red alert" to replenished the now-dwindling salsa reserve. It was perfect. As I was grabbing my bag of salsa, a dude come out from the kitchen with a huge box of tomatoes and placed them all on the grill. I ordered a giant Diet Pepsi and parked myself at a close table to watch the process. That's when I discovered the secret. For super-charred tomatoes they start with firm, chilled tomatoes, that aren't too big or too ripe. I also found out that the tomatoes must start roasting on the grill with the stem-side down. The rest was simple...
Source: Top Secret Recipes Unlocked by Todd Wilbur.