Vegetarian Haggis and Potato Pasties

Name: Vegetarian Haggis and Potato Pasties
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, British
Ingredients: 500g shortcrust pastry (if your pack is smaller that is ok, just make smaller pasties); 4 tbsp wholegrain mustard; 12 generous tbsp veggie haggis; 3 medium potatoes, boiled and cut into cubes; salt and pepper; 1 tbsp olive oil (or egg wash) for glazing the pastry