Marsh House Rum Punch


.75 oz Marsh House Rum
.75 oz Wray & Nephew Overproof Rum
.75 oz pineapple juice
.75 oz lime juice
.75 oz simple syrup
.25 oz grenadine
1 0r 2 dashes Angostura bitters


Add all ingredients into a shaker with ice until well chilled.  Strain into glass with fresh ice and garnish with a maraschino cherry.