Melt some butter in a large saucepan. Add onions and cover with a lid. You'll be simmering these for about 10 minutes or until soft.
Add sugar and the balsamic vinegar, still well, and cover with the lid. Cooking for an additional 5 minutes.
After, add the vegan beef broth and gently boil for 5 minutes, uncovered.
Mix the arrowroot powder and the cold water to form a thin paste, pour about a tablespoon of hot gravy into the starch mixture and mix thoroughly. Pour it back into the onion gravy.
Raise the heat to 'high' and boil for 10 minutes or until the gravy is thickened—season with salt to taste.
Cut your potatoes into bite sizes, bring to a boil, then reduce to a simmer. Cook until the potatoes are done, about 10 minutes. Drain.
Finish the mash by placing the plant milk and 2 tablespoons of vegan butter in the pot, turn the heat onto low and melt the butter. Start mashing away! You can use a potato masher, or you can use a hand mixer for more whipped mash.
Heat the remaining butter in a large non-stick pan, add the Beyond Sausages and fry until golden brown on all sides. That’ll take about 10 minutes.
To plate, spoon the mash onto your dishes. Place two vegan sausages on top and pour the onion gravy over the food, add your peas, and serve warm.
