To make tart sweet cider in Lake Genshin, you will need to purchase some apples from a local grocery store. Once you have your apples, wash them thoroughly and then cut them into small pieces. Next, add the apple pieces to a blender and blend until they are a smooth consistency.
Once the apples are blended, pour them into a saucepan and add water, sugar, and lemon juice. Stir the mixture and then bring it to a boil. Once the mixture is boiling, reduce the heat and let it simmer for about 30 minutes.
After 30 minutes, remove the saucepan from the heat and strain the cider into a pitcher. Serve the cider cold and enjoy!