This is adapted from Food52 Vegan by Gena Hamshaw. Use this recipe as a guide: It’s best to use a balanced mix of vegetables, but the roasting process is forgiving. For instance, I’ve made this with and without zucchini; I’ve used a mix of vegetables that leans heavy on the eggplant at times and heavy on the tomatoes at others. I've used all sorts of peppers, tomatoes, eggplant, etc. Also, I often make a quadruple (or more!) recipe, so don’t be afraid to load up your largest roasting pan. The key is to be patient with the roasting. Let the vegetables cook until the liquids reduce, and the mixture becomes thick and stewy. When I double/triple/quadruple the recipe, I scale the dressing as needed. When my roasting pan is completely loaded, I use 1 cup olive oil and 1/2 cup white balsamic vinegar (or 1/2 cup olive oil and 1/4 cup vinegar), and I cook the vegetables for 3 hours. Also, I often omit the thyme altogether: I simply season each layer of vegetables with salt as I add them to the pan. Then once all of the vegetables are in, I pour over the olive oil and white balsamic vinegar. After 1 hour, I stir it; then I stir it again every hour after that until it has roasted for 3 hours total.