Curried Cauliflower Soup with Roasted Tomatoes

Name: Curried Cauliflower Soup with Roasted Tomatoes
Ingredients: 2 Medium White Onions, large dice; 1 1/2 teaspoons Sea Salt; 5 cups Cauliflower florets, 1 large or 2 small heads; 2 tablespoons Red Thai Curry Paste; 2 cups Fire Roasted Tomato, one 14.8oz can; 5 cups Low Sodium Vegetable Stock; 1 cup Coconut Milk; 1 tablespoon Rice Vinegar (optional)