In a medium mixing bowl whisk together the 5 egg yolks and ¾ cup of the maple sugar until the color lightens. Set aside.
In a saucepan, combine the 2 cups whole milk, 2 cups heavy cream, ⅛ teaspoon salt and the remaining ½ cup maple sugar and bring to gentle simmer over medium-high heat.
Temper the egg yolk mixture by slowly streaming in about a third of the hot milk/heavy cream mixture. Continue whisking while incorporating to avoid any hot spots that can cause a "scrambled egg" effect.
Finish making the custard base by slowly add the rest of the milk/heavy cream mixture to the tempered yolks continuing to whisk.
Return the custard base to the the stove and, over low-medium heat, stir with a until the mixture is thickened and coats the back of a spoon or spatula.
Transfer to a bowl and cover with plastic wrap then refrigerate for 6 hours (or preferably overnight) before churning.
Salted Maple Syrup Swirl
In a small saucepan and over low-medium heat reduce the maple syrup until volume is reduced by about a quarter. This will take about 6-10 minutes. Do not stir.
Once done, transfer to a heat resistant container with a lid. Sprinkle the sea salt across the top or, if you are using a deeper container, alternate pouring the maple syrup and sprinkling some salt until they are both completely used
Cover and set aside until ready to assemble the ice cream.
Making the ice cream
After the maple custard base has been in the refrigerator for at least 6 hours pour it in your ice cream maker and churn according to the manufacturer's instructions.
Transfer the ice cream to your freezer safe container - alternating ice cream with the salted maple syrup swirl until done.
Cover and freeze for at least 1 hour before serving.
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