I was waiting for Amanda to post the Casa recipe but it appears she is awol.
Here is my wife's Casa De Castillo clone recipe salsa. It's best served with Jesse's Tortilla Chips at 13th and Webster, or the high quality HEB bakery department chips. Anyway she likes to make this so it's lower sodium by using a can of no salt added tomatoes. Stick to these exact ingredients and I think you will be pleased. Every time we are in Waco we eat at Casa still, everything they do is great, but living 3 hours from Waco this salsa clone recipe gets us by.
Casa De Castillo Clone Salsa lower sodium version
1 8oz can HEB Tomato Sauce
1 8oz can HEB no salt added Tomato Sauce
1/8 TSP Bolner's Fiesta dry granulated garlic
1/8 TSP Bolner's Fiesta dry whole celery seed
1/16 tsp imperial cane white granulated sugar
3/4 ounce water
3/4 ounce 5% HEB white vinegar
1 and a half 2" long destemmed fresh Serrano peppers.
Add all these things to a blender and pulse to the right consistency. You may need to add about a half ounce water more but just look at it.
The best way to measure the water and the vinegar is with a 1.5oz shot glass just fill half way for each liquid.
You are going to want to eat all of it right after blending, but if you let it steep 2 hours in the fridge it's even better.
Now if we can just get the exact recipe for Casa's Margaritas and enchilada topping, yummm !!
I should add if there isn't a HEB around the wal mart brand tomato sauces are good replacements but don't use hunts it's not the correct flavor profile. Also the Sam's Club members mark / Tone's seasonings seem excellent replacements too. Enjoy and let us know how your results are. Sic em !