Rim an old-fashioned glass with lemon juice and caster sugar.
Place a teaspoon-sized sugar cube into the glass, and saturate with bitters.
Fill the glass three-quarters of the way with broken ice, shake other ingredients (except soda water) and strain into the glass.
Top with a small amount of soda water if desired.
Add two cherries on a stick, garnish with half slices of orange and lemon, and serve.