How to Make the Ultimate Umami-Bomb Vegetarian Demi-Glace
1/2 ounce simple syrup
2 ounces Riesling
3/4 ounce fresh lemon juice
1 1/2 ounces pisco, preferably Quebranta
8 seedless red grapes
In a cocktail shaker, gently muddle the grapes until they burst. Add the remaining ingredients and enough ice to fill a rocks glass and shake well for 20 seconds. Pour the contents of the shaker into the rocks glass.