Place the juice, soda, and a large mixing or punch bowl in the refrigerator for at least 1 hour before preparing the hwachae so everything is very cold.
2 cups chilled Korean or Asian pear juice, white grape juice, or apple juice, 1 cup chilled lemon-lime soda
Slice the watermelon and cantaloupe or honeydew. Use a melon baller to scoop into balls for a classic look, or cut into small, neat cubes. Aim for bite-sized pieces that are easy to scoop with a spoon.
3 cups seedless watermelon, 1 cup cantaloupe or honeydew
Hull and slice the strawberries, halve the grapes, peel and slice the kiwi into half-moons, and cut the apple or Asian pear into thin slices or matchsticks. Toss the apple or pear lightly with a little lemon or lime juice to prevent browning.
1 cup strawberries, 1 cup seedless grapes, 1 medium kiwi, 1 small apple or Asian pear, 1-2 tablespoons fresh lemon or lime juice
In a large glass or punch bowl, gently combine the prepared watermelon, melon, strawberries, grapes, kiwi, apple or Asian pear, and blueberries (if using). Stir gently to avoid bruising the fruit.
3 cups seedless watermelon, 1 cup cantaloupe or honeydew, 1 cup strawberries, 1 cup seedless grapes, 1 medium kiwi, 1 small apple or Asian pear, 0.25 cup fresh blueberries
In a separate pitcher or large measuring cup, stir together the chilled juice, 1/2 cup cold water, 2 tablespoons of your chosen sweetener, and the lemon or lime juice. Taste and adjust with more water for a lighter flavor or more sweetener for extra sweetness.
2 cups chilled Korean or Asian pear juice, white grape juice, or apple juice, 0.5-0.75 cup cold water, 2-4 tablespoons sugar, honey, or agave syrup, 1-2 tablespoons fresh lemon or lime juice
Gently stir the chilled lemon-lime soda and vanilla extract (if using) into the punch base. Stir lightly so you keep as much fizz as possible.
1 cup chilled lemon-lime soda, 1 teaspoon vanilla extract
Pour the sweet punch base over the fruit in the bowl until the fruit is just covered or slightly floating. If your bowl is deep and you have extra liquid, reserve it in the fridge for topping off later.
Cover the bowl and refrigerate the hwachae for 20–30 minutes to let the flavors meld and the fruit lightly infuse the liquid. If you are short on time, you can serve immediately.
Just before serving, gently stir the hwachae once, then add ice cubes or crushed ice on top. Garnish with fresh mint leaves and thin lemon slices if desired.
1-1.5 cups ice cubes or crushed ice, fresh mint leaves, thin lemon slices
Serve the hwachae in small bowls or clear glasses with both a spoon and a straw so guests can sip the punch and scoop out the fruit.