Whisk together the dressing ingredients until smooth and creamy. Add water to thin the consistency if needed.
Evenly divide the dressing between two quart-sized mason jars.
Evenly divide the tomatoes, black beans, corn, avocado and romaine between the two mason jars, layering in that order. Screw on the lid and store in the fridge!
When ready to serve, simply pour the entire contents of the jar into your bowl and enjoy!