Trader Vic's recipe for "Navy Grog" shared with their mailing list (and not to be confused with their "Tiki Grog" recipe)...
Navy Grog
Squeeze 1/2 Lime (save the spent lime shell for garnish)
1/2 oz Lemon Juice
3/4 oz Grapefruit Juice
1 oz Light Rum
1 oz Gold Rum
1 oz Dark Rum
1/4 oz Trader...