The good quality cognacs have a nutty flavor. Adding Frangelico intensifies this flavor. If you have oranges, you can use half the amount of lemon in each drink, replacing the rest with fresh orange pieces. If you want a lighter cocktail, divide mixed cocktail among four glasses and top each with seltzer water and stir. From Five Ingredient Fix
Preheat oven to 375. toast hazelnuts on sheet pan til you just start to smell them. This should take about 5 to 7 minutes
Put hazelnuts and 1/4 cup sugar into mini food processor and pulse til finely ground. Pour sugar nut mixture onto rimmed plate.
In cocktail shaker, muddle lemon chunks and remaining sugar til chunks are broken down and very juice and sugar has dissolved. Add cognac and Frangelico and fill shaker with ice. Shake mixture furiously to chip the ice and chill.
Run a lemon wedge around rims of two 8 oz. rocks glasses and dip them in sugar nut mixture. Pour liquors into glasses, top off with more ice and garnish with lemon wedges. Serve at once.