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To make the syrup, pulse grapes in a blender, enough to break the skins up and loosen seeds.
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Pour mixture through a mesh sieve to strain out skins and seeds. Press firmly to extract every possible drop.
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To make the cocktails, in a non-reactive sauce pan, combine the strained grape juice, sugar, water, zest, and spices. Cook over medium-low heat, stirring frequently, for 15 - 20 minutes (mixture should barely steam.). Toward the very end of cook time, edge heat higher and stir as mixture bubbles up for about three minutes. Remove from heat.
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Set aside to cool, pour into bottles, and seal. Syrup will keep well in the fridge for about a month.
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Fill two tall glasses with ice. Add vodka and lime, and stir. Fill glass with seltzer, drizzle on the Concord syrup, garnish, add spices, and stir.