Coffee: 4 tablespoons per 6-ounces of water or 1 1/2 cups cold-brewed coffee concentrate.
Coffee Concentrate: Put 1/2 cup ground coffee and 1/2 cup cold water in glass container and let sit 12 hours. Strain the coffee grounds with a filter. If the coffee looks cloudy, strain again. You can store up to 2 weeks in the refrigerator. To serve, add cold water, ice, milk, and sugar as desired.
To make Frappe: In a blender, puree coffee, milk, sugar, and ice. For thicker consistency, add more ice and blend. Pour into 2 glasses, and top with whipped cream and chocolate sauce if desired. Serve immediately.