Azuki Ice Cream (Japanese Red Beans Ice Cream)

Prepare the Azuki Beans: In a medium saucepan, combine the dry adzuki beans, 1/3 cup of sugar, lemon juice, and water. Bring the mixture to a boil over high heat, then reduce the heat to low and simmer gently, uncovered, for 2 1/2 to 3 hours, or until the beans are very tender and easily mashed. Ensure the liquid and beans amount to 3 cups; add more water if needed. (Estimated time: 2.5 - 3 hours)

Strain and Cool: Strain the cooked bean mixture through a fine-mesh sieve, using a wooden paddle or spatula to press the beans and extract as much pulp as possible, discarding the skins. Transfer the strained bean pulp to a container and refrigerate until thoroughly chilled. (Estimated time: 2 hours)

Create the Cream Base: In a separate saucepan, combine the milk and heavy cream. Heat over medium heat until the mixture just begins to boil. While heating, whisk together the egg yolks and 2/3 cup of sugar in a medium bowl until light and smooth. (Estimated time: 10 minutes)

Temper and Cook the Base: Gradually drizzle about 1/4 cup of the hot cream mixture into the egg yolk mixture, whisking constantly to temper the eggs and prevent them from curdling. Pour the tempered egg mixture back into the saucepan with the remaining cream. Cook over low heat, stirring continuously with a spatula or wooden spoon, until the mixture thickens enough to coat the back of a metal spoon. Be careful not to overheat or boil the mixture, as this can cause lumps to form. (Estimated time: 5-7 minutes)

Infuse and Chill: Remove the cream base from the heat and stir in the vanilla extract. Transfer the mixture to a clean container and refrigerate until completely cold. (Estimated time: 2 hours)

Combine and Churn: Once both the azuki bean mixture and the cream base are thoroughly chilled, gently stir them together until well combined. Pour the mixture into your ice cream maker and churn according to the manufacturer's instructions until it reaches a soft-serve consistency. (Estimated time: Varies based on ice cream maker)