1. (This recipe prepares the polenta in a slow cooker. If you prefer a stovetop and oven method for quicker cook time, use Creamy Polenta recipe method then proceed to step 6.)
2. For the polenta: Preheat the slow cooker to high.
3. Turn the slow cooker to low and grease the walls of the pot with 1 tablespoon (per 4 servings) of the fat.
4. Add garlic, broth, cornmeal, and remaining fat to slow cooker.
5. Stir well; cover and cook on low for 6-9 hours (3-4 hours on high), stirring occasionally. While the polenta is cooking prepare the roasted veggies.
6. For the roasted veggies: Preheat oven to 350F.
7. Peel red onion. Cut eggplant, zucchini, yellow summer squash, red onion, and bell peppers into 3/4 inch pieces. Remove thyme from stem.
8. Place veggies in a large bowl and toss with olive oil, sea salt, and pepper to taste.
9. Line a baking sheet with silpat or parchment paper. Arrange veggies in a single layer on the lined sheet.
10. Roast, tossing once, for 20-25 minutes until the veggies are caramelized.
11. When polenta is finished cooking, season with salt and pepper to taste.
12. Transfer polenta mixture to a greased 8 inch baking dish. Bake polenta until it begins to set - about 15 minutes.
13. Remove from oven and top evenly with roasted veggies. Bake until veggies are warm. Remove from oven and serve.