Bring a steamer pot of water to a boil. Bring a jug of water to a boil.
Steam potato
Peel 300 g potato and 200 g sweet potato and dice into chunks. Put the potato and sweet potato in the steamer pot of boiling water and cook 10-12 minutes, until tender. Drain the pot, transfer the potato and sweet potato into the drained pot and cover to keep warm.
Prep ingredients
Meanwhile, peel and finely dice 1 brown onion and 1 carrot. Peel and mince 4 cloves garlic. Crumble 2 cubes chicken stock into a heatproof jug, add 250ml of boiling water and 2 tsp Dijon mustard and stir to dissolve.
Cook veggies & pork
Heat 1 tbsp olive oil in a medium-deep frypan over medium-high heat. Cook the onion, carrot and garlic, stirring occasionally, for 4-5 minutes until softened. Add 500 g pork mince, breaking up lumps with a spoon for 3-4 minutes, until almost cooked.
Finish veggies & pork
Sprinkle 2 tbsp flour over the pork and vegetables and cook, stirring, for 2 minutes. Then gradually add the stock, stirring constantly to prevent lumps from forming, and bring to a boil. Reduce the heat to medium-low add 1 cup frozen peas and cook, at a very gentle simmer, for 3 minutes or until the sauce is thickened. Preheat the grill to medium-high.
To finish
Mash the potato, sweet potato and ¼ cup milk until smooth, season with salt and pepper and stir to combine. Transfer the pork mixture to a baking dish. Spoon the mash over the pork mixture and grate over ½ cup cheese. Grill for 5 minutes or until melted and golden.
To serve
Divide the pork and veggie pot pie with cheesy mash between plates.