Combine all of the ingredients in a blender or a food processor and blend until smooth. Add more water to thin as needed. If you're sensitive to the flavor of citrus, you might want to start with 1 lime and 1 lemon and taste test before adding the second.
To make quinoa vegetable bowls, cook 1 cup quinoa and roast or grill 2 portobello mushrooms, 2 zucchini, and 4 Yukon gold potatoes. Divide between 4 separate bowls and serve with chimichurri sauce.
Notes
Leftovers can be stored in an airtight container in the refrigerator for 1-2 days.