1 Preheat the oven to 400°F.
2 Line three baking trays with parchment paper.
3 Toss the onion, garlic, radicchio, fennel, eggplant, green beans, zucchini and tomatoes in a mixing bowl. add a splash of olive oil, a pinch of salt, a grind of pepper and a dash of balsamic vinegar and toss.
4 Spread out on a baking tray (or two, if necessary) and roast until just browned.
5 Toss the potatoes with some olive oil and roast separately until browned.
6 As the vegetables complete the cooking cycle, throw them in a bowl or pot along with the fresh basil leaves. You can add more olive oil, salt, pepper, or balsamic vinegar as needed.
7 If you want a much saucier dish you can transfer everything to the stove and add a can of tomatoes (sauce, puree or chopped) and let it simmer for five or ten minutes.
8 Rewarm as needed, in the oven or on the stove — even on a hotplate for Friday night.