For the sauce:
Put the water, tomatoes, 1/2 an onion, and garlic cloves in a large pot over high heat and bring to a boil. Reduce heat and simmer until the tomatoes are soft. Remove from heat and let sit to cool for 2 minutes. Pour into a blender and add the chipotle, ketchup and salt. Blend for approximately 30 seconds.
For the shrimp:
Slice the remaining 1 1/2 red onions. Heat the oil in a large saute pan over medium-high heat. Add the onions and saute until golden brown. Stir in the shrimp and garlic salt and cook for 2 minutes. Pour sauce over shrimp and let simmer for 5 to 8 minutes. Transfer to a serving bowl and serve over Mexican rice, if desired.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Baudelia Ochoa, mother of the owners of Los Taquitos, in Phoenix, AZ