If you don't feel like sauteing all those veggies - toss em on a sheet pan with garlic and olive oil,kosher salt and fresh grnd pepper and roast til caramelized/colored, around 45 mins at 400ish. The flavors are really really nice. Toss it with pasta, then, or just eat it, or make a pressed sandwich (stick rat in some french bread with some pesto slapped on and weight it down with a brick overnight) and take it to a picnic.
(Here I used 2 tomatoes (plunge into boiling water for 1 minute, peel off skin, chop into chunks before roasting), 1 zucchini, 1 eggplant, chopped, 1 sweet onion, chopped, 1 green pepper, chopped,(for traditional ratatouille) but any combo of veg you like I'm sure would be delicious. Oh and fresh basil! Rip some bits and toss them along with everything.