Traditional pie 'n' mash with parsley liquor

Name: Traditional pie 'n' mash with parsley liquor
Prep time: 45 min
Cook time: 45 min
Total time: 1 h 30 min
Cuisine: British
Ingredients: 1 tablespoon Olive oil; 1 Onion chopped; 2 Garlic cloves peeled and chopped; 450g Mince Meet; 1 teaspoon English mustard; 1 tablespoon Tomato puree; 1 Beef stock; Vegetable oil; 150 ml brown ale; 100 ml Beef stock; 2 tablespoon Plain flour; Salt and pepper; 350 grams Self raising flour Extra for Dusting; 225 grams beef suet; Large knob butter; 450 grams ready made short crust pastry; 1 free range egg; 2 large potatoes peeled and chopped; 100 ml hot milk; knob of butter; 50g Butter; 50g Cornflour; 500 ml Chicken Stock; Generous parsley leaves; 1-2 Garlic cloves pured