Ground beef and mashed potatoes gratin

Ingredients

For mashed potatoes
• 1kg potatoes - peeled, cut into quarters
• - Ingredient A -
• 40g butter
• 1 tsp sugar
• 1/2 tsp fine salt

For the topping
• 1 tbsp olive oil
• 350g ground beef
• 2 garlic cloves - finely chopped
• 1/2 onion - finely chopped
• 160g brown mushroom - thinly sliced
• - Ingredient B -
• 2 tsp soy sauce
• 1 tsp kosher salt
• 1 tsp sesame oil
• 1 tbsp mayonnaise
• 1 tbsp tsuyu
• 1/2 tsp sugar
• 320g sour cream
• 50g or more (as your choice) grated cheese

Instructions

• 1. Place potatoes in large saucepan and add enough water to cover. Bring to a boil. Reduce the heat to medium-low, cover and simmer for 15 to 20 minutes or until easily pierced with a fork. Drain well.
• 2. Transfer potatoes in a bowl and add the ingredient A (butter, sugar and salt), then mash the potatoes until creamy with a potato masher or fork. Place the mashed potatoes into your ovenware. Set aside.
• 3. Make the beef topping : In a skillet, heat 1 tbsp olive oil and fry the garlic until fragrant. Add onion, beef and mushrooms, continue stir frying until it becomes wilted. Add the ingredient B to season and simmer for a few minutes.
• 4. Add sour cream and mix, stir for a few more minutes.
• 5. Preheat the oven to 200C° degree.
• 6. Sprinkle cheese over the mashed potatoes and pour the beef mixture over the cheese.
• 7. Bake in the preheated oven for 30 to 35 minutes.
• Serve hot!

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