I do it with a meal prep system. I cook a variety of vegetables every few days (mostly steamed) and put them in containers like this.
I also make bean soup and some kind of whole grain.
When I’m ready to make a meal, I combine the pre-cooked vegetables in various ways. The meal goes in a large glass bowl with a cover so I can cover it back up if I don’t finish it all at once.
You can also count things like garlic, seeds, nuts, and fruit in addition to vegetables. I listed example plant species from a day’s eating in a post on time-restricted feeding.