Wet martini glass, fill with ice and place in freezer for 5 minutes.
Fill cocktail shaker with ice and add De Kuyper Crème de Bananes, Frangelico, vanilla vodka and half and half to shaker and shake vigorously.
Remove martini glass from freezer and toss ice.
Put chocolate syrup in squeeze bottle and drizzle around martini glass. Start at the top and slowly spin glass to get an even swirl to bottom of glass.
Strain contents of cocktail shaker into glass.
For garnish, put banana slices on small metal pan. Sprinkle with an even layer of sugar and torch until sugar turns a caramel color.
Cut slit in banana slice with paring knife and place on rim of martini glass.
Notes
Because dessert cocktails are so sweet, serve the banana martinis with an assortment of fresh fruit rather than chocolates or cake.