Photo by Leslie KellyRegan Curran is the grill master at Palace Kitchen, but his coolest contribution is a hand-crafted tonic that’s got restorative powers. Call this cook Dr. Feelgood. Read part one and part two for Curran’s kitchen bio.Palace Kitchen’s Tonic Water4 cups water1 ounce powdered cinchona bark (available at World Spice)1 cup chopped lemongrass (about 1 stalk)Zest and juice of 1 orange, 1 lemon, and 1 lime1 teaspoon whole allspice1/4 cup citric acid (available at home brewing stores)1/4 tsp kosher salt3 cups simple syrupPhoto by Leslie KellySummer’s perfect cocktail with Regan’s hand-crafted tonic.Combine all ingredients in a medium saucepan and bring to a boil. Once mixture boils, reduce heat to low, cover, and simmer for 20 minutes. Strain through a fine mesh sieve and cool, once cool add 3 cups simple syrup. Store in the fridge for up to four weeks.Before serving, add a little bit of club soda.Bottoms up!