Traditional Cottage Pie

Name: Traditional Cottage Pie
Ingredients: 1 Tbsp Olive oil; 1 kg Ground beef; 3 cloves garlic, crushed; 1 large Onion, finely chopped; 1 sprig Rosemary, leaves removed and chopped finely; 2 cups of frozen peas (petit pois); 4 Carrots chopped into rounds, then quartered into roughly 1cm pieces; 100g sweetcorn, drained; 600ml Beef stock; 2 tbsp Worcestershire Sauce; 2 tsp Marmite; 1 tbsp Tomato puree; Salt and pepper; 1 tsp mixed herbs; Parmesan Cheese, finely grated; For the mash:; 1kg Potatoes, peeled and halved (the best tasting ones you can find); 20 g Knob of Butter; 1/2 tsp Nutmeg powder; 50 ml Splash of Milk; 2 tbsp Hellmann’s Mayonnaise; 50g Cheddar Cheese, grated