Shrimp & Chorizo Sausage Tacos

1 lbs shrimp

½  lbs chorizo sausage

1 white onion

8 tortillas

2 roma tomatoes, diced

2 tomatillos

2 garlic cloves, minced

2 limes

½ cup cilantro

 

Chili Sour Cream Drizzle

½ cup sour cream

¼ cup half and half

1 tsp chili powder

⅛ tsp onion powder

1 garlic clove, minced

dash of ancho chili powder

dash of chipotle chili powder

salt to taste