In a heavy saucepan over medium heat, whisk together half of the sugar (1/8 of a cup equals 2 tablespoons) and all of the milk and cream until the sugar dissolves and the mixture almost boils, about 2-3 minutes. Meanwhile, whisk together the remaining sugar and the egg yolks until it is yellow and creamy, about 2 minutes. Add about a 1/4 cup of the cream mixture into the eggs and whisk to combine. Pour the egg/cream mixture it into the cream mixture on the stove. Whisk in Ovaltine, vanilla and a pinch of sea salt and cook, stirring occasionally, for about 8 minutes or until the mixture coats the back of a spoon. Remove from heat and then strain the mixture into a bowl. Allow to cool on the counter then cover and place in the refrigerator to cool completely. Remove from the refrigerator and stir in the chocolate bits. Pour into a ice cream maker and churn until cold and set. Place in a freeze-safe container and freeze until solid.