1. Pour 1 bottle of beer into an ice tray and freeze into ice cubes in the refrigerator
2. Dig out half of the watermelon, put it in a food processor, squeeze in half of the lemon juice, and beat into juice
3. Filter the watermelon juice into a bowl, skim off the foam
4. Carve the edge of the watermelon cup with serrations and pour the watermelon juice
5. Pour in beer ice cubes, then pour in 1 bottle of cold beer and mix well
6. Served with waffles
