Peel the potatoes and cut into smaller pieces. Boil them in a saucepan with water enough to cover the potatoes for about 10 minutes or so or until they are fork-tender. Drain off water and. If you choose the pressure cook, pour 1 cup of water into the inner pot of Instant pot. Place a trivet and put the cut potatoes on top of it. Pressure cook on high pressure for 5 minutes. If you cut the potatoes smaller you may only need 3 minutes. The time depends on the size of the potatoes
Mash the potatoes:
Mash the potatoes while they are still warm with butter, coconut milk, salt, pepper, and yolks until they are well-combined
Prepare the filling:
Soak wood ear mushrooms and noodles separately in warm water until softened. The mushrooms wil double or triple in size. Cut into thin strips. Cut the noodles into shorter pieces, about 4-5 inches
Preheat a skillet/wok. When it's hot. Add butter. It will melt. Add diced onion and stir fry until fragrant and soft, about 3 minutes. Add the ground meat and stir fry until they turn color and cooked through, about 3 minutes or so. Sprinkle in the all-purpose flour, mushrooms, noodles, seasonings and spices and broth. Bring to a gentle simmer and then cover to let it slowly simmer for about 10 minutes. Stir in the mixed veggies and give it a stir. The sauce has thickened slightly. Have a taste and adjust by adding more salt if necessary
Assembling the pastel tutup:
Preheat oven to 400 F (204 C). Use a 7 x 11 inch glass baking dish. Spread half of the mashed potato mixture on the bottom of the dish. Spread the filling evenly on top of it after that. Cover the filling with the rest of the mashed potato mixture starting from the edge to prevent the filling from bubbling up while baking. Smooth it with a rubber spatula
Baking:
Place the dish in the oven, third rack from the top and bake for about 25 minutes until the top just lightly golden brown. If you want a deeper golden brown, you can turn on the broiler (top heat) and broil it for few minutes until you are happy with the color, but watch it closely or it may create burn spots later
Serving:
Remove from the oven and let it cools down for 15 minutes before serving