To make the strawberry simple syrup, add all of the ingredients to a saucepan. Bring the mixture to a gentle boil over medium heat. Using a fork or potato masher, break up the strawberries to help infuse the simple syrup. Allow the mixture to gently bubble for 5 minutes. Remove the pan from the heat and allow the mixture to cool for 10 minutes. Strain the mixture. Store in the refrigerator in an airtight container for up to 1 month.

To make the cocktail, add the gin, Campari, orange juice, lemon juice, bitters,  and strawberry simple syrup to a cocktail shaker. Give the mixture several vigorous shakes. Strain into a highball glass filled with ice. Top with champagne and give the mixture a gentle stir to combine. Garnish with fresh strawberries and an orange peel.