The rosé provides a light, floral base, adding an elegant touch to the cocktail.

Substitutions:

• White Wine: If rosé isn't available, a dry white wine like Sauvignon Blanc or Pinot Grigio can be used. It won't have the same color or slight berry notes, but it will provide a similar light and crisp base.

• Sparkling Wine: For a bubbly twist, you can use a dry sparkling wine like Prosecco or Champagne. This will add effervescence to the cocktail.

Fresh watermelon juice contributes a sweet and juicy element, enhancing the overall freshness.

This syrup infuses an herbaceous depth, complementing the fruity notes of watermelon.

Preparation:

• Steep fresh mint and basil leaves in hot simple syrup overnight and then strain.

Substitutions:

• Mint Syrup: If basil isn't available, you can use a mint-infused simple syrup. This will still contribute a refreshing herbal note to the cocktail.

• Basil Simple Syrup: Conversely, if you have basil but not mint, you can make a basil-infused simple syrup. It will add a slightly different herbal profile to the drink.

White rum introduces a subtle kick and rounds out the flavor profile with its mild sweetness.

Substitutions:

• Vodka: Vodka can be used as a neutral substitute for white rum. It won't have the same slight sweetness, but it will provide the necessary alcoholic base.

• Light Rum: If you have light or silver rum on hand, it can be used as a closer alternative to white rum. It offers a similar flavor profile.

This vinegar offers a tangy twist, adding a unique layer of complexity to the cocktail.

Substitutions:

• Rice Vinegar: If you don't have ume plum vinegar, a mild rice vinegar can be used. It will provide a tangy element without the distinct plum flavor.

• White Wine Vinegar: Another option is white wine vinegar, which has a mild and tangy flavor that can complement the other ingredients.

A sprig of fresh mint or a small watermelon wedge can be added as a garnish for visual appeal and an extra burst of aroma.