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1
Have the butter cut into 1 cm cubes and frozen.
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2
Put the butter and the sifted dry ingredients into a food processor and process until the whole thing becomes grainy.
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3
Add the ingredients marked with to the food processor and blend.
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4
Turn out the dough onto a work bench and knead it a bit.
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5
Then shape it into a round disk and cover with plastic wrap and chill in the fridge for at least 1 hour (prepare it on the day before if you can).
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6
Cut the sweet potato into bite-sized chunks and soak in water.
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7
Then drain it, add the milk, cover it with plastic wrap, and microwave it for 8-10 minutes.
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8
Mash the potato afterward.
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9
Add the margarine, the sugar, and the egg yolk in that order to Step 4 and mix thoroughly after each addition.
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10
Finally, add the cream and mix well.
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11
Turn out the chilled dough onto a work surface dusted with flour and roll it out to a thickness of 4-5 mm.
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12
Line the tart pan with the dough, and cut off the excess dough with a knife (you can freeze the leftovers).
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13
Dock the dough, cover with aluminum foil, put a pie weight on it, and bake in an oven preheated to 180C for 10-15 minutes.
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14
Let the crust cool after it has been baked.
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15
Fill the tart crust (Step 7) with the filling (Step 5).
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16
Brush on some egg wash (egg yolk mixed with water), and sprinkle on some black sesame seeds if you desire.
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17
Bake for 20 minutes at 190C, then raise the temperature to 220C and bake for about 10 more minutes (adjust baking time as to not burn it).
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18
When it's done baking, place on a wire rack and cool.
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19
Take it out of the tart pan once it has cooled.
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20
Cut up into your desired size.
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21
Depending on the oven you use, baking time and temperatures may vary.
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22
Please pay attention and adjust accordingly.
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23
If you don't have heavy cream, you can substitute it with milk, but it'll turn out more moist and tasty with the cream.
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24
Adjust the amount of sugar depending on how sweet the potato is.
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25
You can make this with an toaster oven as well: https://cookpad.com/en/recipes/143577-easy-delicious-sweet-potato-cakes