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Place egg yolks, corn starch and sugar in a bowl, add the remaining 1/3 of the milk and whisk until smooth.", "When the milk is simmering, ladle/pour a little by little of the hot milk to the egg yolk mixture about 1/4 at a time, whisking as you add the milk, when mixture is homogenized. Pour everything back into the pot.", "Keep whisking until it reaches a boil. Take off heat and strain it into a container. Cover with plastic wrap, the wrap should be touching the surface of the pastry cream. Let cool and chill until ready to use.", "Heat milk until warm in a microwave oven, until lukewarm. Pour into bowl of a stand mixer fitted with dough hook. Add yeast and stir. Let stand for 10 min.", "Beat in granulated sugar, butter, egg and salt. Add flour. Beat on medium-high until dough forms a ball and pulls away cleanly from the sides and bottom of the bowl, about 5 min.", "Start the mixer on low speed with a dough hook to mix the dough until it comes away from the side of the bowl, about 2 - 3 minutes.", "Brush a medium bowl with oil. Line a large baking sheet with parchment. Lightly brush with oil.", "Scrape dough out of mixer bowl into oiled bowl. Lightly oil top of dough and cover with a damp tea towel (not terry cloth). Let stand in a warm place until dough doubles in size, about 1 hour. OR cover with plastic wrap directly onto the surface of the dough, cover the bowl with another sheet of plastic, leave in the fridge overnight.", "Roll out dough on a floured surface to 1/2 to 3/4 in. thick. Using a 2.75-in. round cutter, cut into 20-24 rounds. Transfer to prepared sheet. Cover with same damp tea towel and let stand until doughnuts double in size, about 45 min.", "Pour oil into a pot until it reaches 1 in. up the sides. Clip a deep-fry thermometer to the side. Heat over medium until temperature reaches 325F. Adjust heat as necessary to keep temperature at 325F during cooking. Fry doughnuts, 4 at a time, flipping halfway through, until golden, 2 to 3 min. Drain on paper towels.", "When the doughnuts are completely cooled, poke a hole on the side of the doughnuts.", "Fill a pastry bag with pastry cream fitted with a medium plain tip, or with a bismark tip if you have one.", "Caramel Glaze