What cocktail has rich demerara syrup and either rye whiskey or gin?

It appears that none of the cocktails you've found specifically includes demerara syrup as an ingredient. However, based on your search for a cocktail featuring either rye whiskey or gin, I can offer some tailored recommendations among the given options that might satisfy your palate. These suggestions highlight the rich and robust flavors of rye whiskey and gin, which often pair beautifully with richer sweet elements like demerara syrup. Perhaps you can try these and see if they align with your taste, or consider adapting them slightly to include demerara syrup.

The Perfect Manhattan (Rating: 4.8/5) is an excellent choice if you're looking for a rye whiskey-based cocktail. This drink features a harmonious blend of rye whiskey, both red and white vermouths, and Angostura bitters. The sophistication and balance in this cocktail might appeal to you, and adding a touch of demerara syrup could provide the richer sweetness you desire.

If you're open to exploring gin, the Gin Cocktail (Rating: 4.6/5) can be an elegant and refined option. With gin, Boker's bitters, sugar syrup, and orange liqueur, this drink has a lovely balance of citrus and herbal notes. You can consider substituting the sugar syrup with demerara syrup to achieve that richer sweetness you're looking for.

While these cocktails do not include demerara syrup by default, they both offer a solid foundation that can be adapted easily to meet your preferences. Enjoy experimenting and creating a cocktail that perfectly suits your tastes!