Add the dressing to the bottom of each jar.
Layer the tomatoes, cucumbers, red onion, celery, asparagus, peppers and carrots to the jar.
Top with the mushrooms, baby corn and lettuce.
Seal jar with lid. When ready to eat, tip the jar upside down (with the lid still on!) and allow the dressing to run down to cover the vegetables at the top of the jar.
Open the lid and serve.