Step 1.
- Fill an Old Fashioned glass with ice cubes.
Step 2.
- Pour 1.5 ounces of dry sherry over the ice.
Step 3.
- Add 1.5 ounces of sweet vermouth.
Step 4.
- Top with soda water to taste.
Step 5.
- Stir gently to combine the ingredients.
Step 6.
- Garnish with an orange slice and an olive.