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Boil potato and simmer for 15 minutes until tender. Drain and retain the cooking water then mash with the Sriracha Mayo.
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Heat the oven to 200C/180C fan/gas 6. Heat the oil. Add the onion and cook over a medium low heat for 3-4 minutes, stirring until softened.
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Stir in the minced beef, breaking it up with a wooden spoon and cook for 3 minutes, stirring until it is no longer pink.
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Stir in Lee Kum Kee (Professional) Gluten Free Oyster Sauce , the carrots and garlic, and cook for further 3 minutes.
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Add the lentils, tomato puree, thyme and 250ml water from the boiled potatoes. Stir well and simmer, covered for 10 minutes then tip into an ovenproof dish.
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Top with the mashed potato and bake for 30 minutes.