Genuinely not trying to be an asshole:
Set a daily timer on your phone just labelled 'PERISHABLE VEGETABLES IN FRIDGE' ... ?
Like, have it go off every day?
Or maybe label it 'Meal Prep Time'?
Set 'appointments' in your calendar for specific meals, a few times a week, with the actual instructions for making a meal?
Or, like, once upon a time, it used to just be fairly normal to set aside a few hours on the weekend (or some off work day) to do a significant amount of meal prep, store it for the week, then that stuff is either good to go, or just needs minimal additional work (quick flash in a toaster oven or what not) to make it good to go, day of.
I dunno, as best I can tell I don't have ADHD, but I did have major depression for a while, and part of what helped me out of that was just strictly regimenting myself, untill I didn't need the alarms anymore. I know ADHD ain't the same, but... might be useful/relevant?