Optionally, chill your old fashioned glass in the freezer for a few minutes.
Fill an old fashioned glass with ice cubes.
Using a jigger, add dry gin, white vermouth, Suze or other white bitters into the glass.
Stir the mixture gently with a bar spoon for about 20-30 seconds to ensure everything is well-mixed and chilled.
Twist an orange peel over the glass to release its oils, then drop it into the drink for a touch of citrus aroma.
Notes
Different brands of white vermouth can have varying levels of sweetness and herbal notes. Feel free to experiment with different brands to find your perfect balance.