Vegetable Ragout with Polenta slices (Vegan)

I modified this from a food network recipe (mine is much more simple)

1 onion, chopped
1 stick of celery hearts, chopped
3-4 carrots, chopped
2 yellow squash, cut into half coins
2 zucchini, cut into half coins
1 eggplant, cubed

1 small can tomato paste
handful of fresh parsley, chopped
4 fresh basil leaves, chopped

1 tube of cooked polenta (store bought)

Saute veggies in tsp of olive oil until soft. Salt and pepper to taste. Add tomato paste and 1-2 cans full of water (enough to thin the consistency a bit) and fresh herbs and simmer for 5-10min. Slice polenta into rounds and lightly sauté to warm through on both sides. Serve rounds covered in ragout.