Prepare the Strawberries:

In a large pitcher, add the sliced strawberries.

Mix the Liquids:

Pour the simple syrup and white rum over the strawberries. Stir gently to combine, allowing the strawberries to macerate slightly and release their natural flavors.

Chill:

Refrigerate the mixture for at least 1-2 hours to allow the flavors to meld together. This step is crucial for developing the sangria's depth of flavor.

Add Sparkling Rosé:

Just before serving, top the sangria with the sparkling rosé wine to add a refreshing and fizzy touch.

Serve:

Pour the sangria into glasses, making sure each glass gets a few slices of strawberry. Garnish with a sprig of rosemary if desired, which adds a nice aromatic touch.

Enjoy:

Serve chilled and enjoy the fresh, fruity flavors with a delightful sparkling finish.