You make more sugar syrup as needed for the recipe. If you made less, the sugar syrup would become solid because of the heating (and therefore no longer be syrup). Use the remainder for another delicious cocktail or keep it until you make another cocktail. It will last for at least a week.
Put the sugar and the water in a pan and heat it over low heat while you stir.
When the sugar has dissolved, turn off the heat and let the syrup cool.
Sour sherry cocktail
Cool the glasses in the fridge so that your cocktail stays cool longer.
In a cocktail shaker, add ice, sherry, lemon juice, egg whites and sugar syrup.
Shake for 1 minute until a nice foam layer is created.
Pour it through the sieve of the shaker (this way the cocktail doesn't dilute) into the glass and serve immediately.