Next, blend the marinade. Put the garlic and jalapeño in a blender, food processor, or tall container for an immersion blender. Add the oil, salt, lime juice, lemon juice, cumin, and smoked paprika. Blend until completely smooth. Taste it. It should be bright, smoky, and well-seasoned. If it tastes flat, add a pinch more salt.
¼ cup neutral oil , 2 teaspoon kosher salt, 3 limes, juiced, 1 lemon, juiced, 1 teaspoon cumin, 1 teaspoon smoked paprika, salt to taste