Rinse the dried mung beans or red beans under cold water.
In a medium pot, combine the beans with 4 cups of water.
Bring to a boil, then reduce the heat and simmer until the beans are tender, about 30-40 minutes. If using red beans, they may take longer to cook.
Drain the beans and set aside.
In a separate pot, bring 4 cups of water to a boil.
Add the tapioca pearls and cook until they become translucent, about 10-15 minutes, stirring occasionally to prevent sticking.
Drain the tapioca pearls and rinse under cold water to remove excess starch. Set aside.
In a large pot, combine the cooked beans, cooked tapioca pearls, coconut milk, granulated sugar, vanilla extract, and a pinch of salt.
Bring the mixture to a gentle simmer over medium heat, stirring occasionally to dissolve the sugar.
Cook for about 10 minutes, allowing the flavors to meld together.
Ladle the Che into serving bowls.
Enjoy your meal!