Session Manhattan

Chill the martini glass in preparation for serving.

Combine sweet vermouth, Amontillado sherry, rye, dry vermouth, and 2 dashes of Angostura bitters in a mixing glass filled with ice.

Stir the mixture thoroughly until well chilled and properly diluted.

Strain the mixture into the chilled martini glass.

Garnish with a twist of lemon zest, ensuring the oils are expressed over the drink before placing it in the glass.