Peel potatoes and cut into cubes
Add potatoes to a medium to large pot, cover them with water. Cook on a medium-high heat, covered, until boiling. Boil til tender.
Drain potatoes in a colander and add to a medium or large mixing bowl. Mash coarsely, allowing the potatoes to have some texture.
Add some plant-based milk to make them creamy.
Add your seasonings--salt, basil, and dillweed (if desired).
Core your half head of cabbage; slice and cut into bite-sized pieces.
Steam the cabbage in the top basket of a vegetable steamer--steam til just beginning to become tender.
Remove the basket and add the steamed cabbage to the mashed potatoes. Stir together.
Cut the onion into small pieces. Saute in about 1/4 cup vegetable broth (add more if needed).
Cook the onion until it is translucent. Then add to the colcannon. Mix in thoroughly.
Put the colcannon into a serving dish and enjoy.