In a large bowl, combine egg yolks with ¾ cup sugar and mix with a handheld mixer until fluffy, about 3 minutes.
In a sauce pan, combine milk and cream and remaining 2 tablespoon sugar, bring to a simmer (do not boil). slowly add warm milk to the egg mixture. Return the mixture to the saucepan. Turn heat to medium low and cook stirring constantly, until mixture is thick enough to coat the back of a spoon (about 5 minutes) again, do not let the mixture boil. Turn off the heat, add the matcha and mascarpone. Blend until smooth. Pour mixture into a glass bowl add lemon juice and salt. Mix to combine.
Cool over an ice bath for about 30 minutes. Be sure to stir the mixture to aid cooling process. Pour custard into ice cream maker and process per the manufacturer's instructions. Serve immediately or transfer soft serve ice cream to an airtight container and freeze until firm. About 2 hours