They bubble formation occurred when I was steaming onion and carrots in a small amount of water.
Quick Vegetable Soup
Steam chopped onion and grated carrot in small amount of water. Add frozen vegetables. When vegetables are softened, add tomato soup or Spicy V-8 or a combination with 1 or 2 vegetarian bouillon cubes.
Can be served as is or with saltines, with Matzos, toast, rice, or pasta.