. . . all those "tough" things you usually trim away and discard: fennel stalks (and core), the ends of asparagus, broccoli stems, collard or kale ribs, cauliflower cores (and leaves). I just have two words for you: food processor. All of those things can be rendered edible by whacking them around in a food processor to make veggie "rice." Boom.
Disclaimers:
1. Dried out things (onion skins) can't be rescued
2. I haven't tried butternut squash skin, but I'm thinking that even if it got turned into rice it would be nasty.
3. Bean pods: I've made broth from them, but I've never tried to rice-ize them. Next on my list.
