Ingredients:

37.5ml Bombay Sapphire
20ml Port 
10ml Oloroso Sherry
20ml freshly squeezed lemon juice
2x blackberries
1x orange slice
Glassware:  Stemmed beer glass
Ice: Shaken with good quality cubed, topped with a duvet of crushed ice 
Garnish:
Orange slice
Lemon peel
1x blackberry
Mint sprig
2x clear non-bendy 7" straws

Method:  Place all of the ingredients into a cocktail shaker with cubed ice. Shake well for 20 seconds then pour the entire contents back into the serving glass (this is called dumping). Top with a duvet of crushed ice then place all of the garnishes appealingly around the crushed ice.  

The Savoy's 1920s cocktails