Put them in a pot.
Add some salt, pepper and seasonings. Be creative.
When the vegetables are done, taste the broth and adjust seasonings to taste. Then, pour the broth through a strainer into a jar.
The broth can be stored in the refrigerator for several days. Or, it can be frozen for use at a later date.
Finally, DO NOT throw the cooked veggies into the trash! Put them in your compost bucket where they can be recycled into your compost pile.