This isn't a new idea by any means, but it definitely works for me. When I am chopping vegetables for one dinner I just keep chopping. I already have my cutting board, knife and compost container, why not just keep chopping?
Then I go ahead and group the vegetables together for the rest of the week's dinners, if I have my menu planned. Sometimes they go in the freezer, if it's say a Monday and I am not using them til Friday. But sometimes I will go ahead and put them in a large plastic bag with the rest of the meal.
For example I am making this pot roast, I went ahead and put my peppers and onions in the bag with the meat. But I didn't stop there. I added all the seasonings I would be using, like basil, garlic and Worcestershire sauce. Then I wrote on the bag and stuck it back in the fridge with the roast. Now all I have to do is dump it in the pot with a little bit of water.
Because I am so cheap there is a good likleyhood that this bag will be wash out and reused.