Easy Curried Cauliflower Soup
1 (32 fluid ounce) container chicken stock, o… 1 head cauliflower, chopped 1 tablespoon butter 1 tablespoon olive oil, or as needed 2 tablespoons yellow curry powder 3 carrots, cut into 1/2-inch slices 3 cloves garlic, peeled, or more to taste 4 dashes hot sauce (such as Tapatio®), or mor… salt and ground black pepper to taste ½ onion, sliced, or to taste ½ red bell pepper, sliced