Add the flour, sugar, yeast together and mix. Gradually add 1-1/2 cups water and mix until a dough forms. It must be slightly sticky so don't add unnecessary liquid. Knead for 10 mins (this will help the dough become less sticky). Rise for 1 hour or until doubled.
In a large casserole, brown the onion and mushrooms in oil. Note: if you'd like to add meat, start by browning the meat with oil until browned, then add the onions and mushrooms and continue with the recipe as is.
Add tomato paste, garlic, sea salt, mustard powder, smoked paprika, white pepper and sauté until the tomato paste starts to darken.
Add the carrots, celery and liquid stock and stir.
Add the butternut and potatoes to the stew and stir. Cover and simmer until the potatoes and butternut is fork tender. Preheat the oven to 180 degrees Celsius.
Mix the corn starch with 4 tbsp water. Remove the stew from the heat, add the baby marrows and corn starch slurry. Mix well.
Add parsley to the dough and combine. Section the dough into 8 equal balls and gently place on top of the stew, ensuring there's enough space in between each ball. Cover and bake for 40-45 minutes.