The Robson cocktail is interesting. Not many drinks in this vein use dark rum. I made one for my husband as well, which is why there are two.
Not a bad drink if you want something to sip that isn't too dry and has an interesting, exotic flavor.
2 tsps lemon juice
1 tbsp orange juice
1.5 tsps Grenadine (homemade)
1 oz Jamaica Rum (Myer's)
Shake with ice and strain into a chilled cocktail glass.