Pour about half the tonic into a bowl. Scatter the gelatin over the surface, do not stir, set aside until the gelatin blooms (softens). Meanwhile, warm the rest of the tonic over very low heat until just simmering. Whisk hot tonic, then gin and lime juice into the gelatin. Pour jelly into 4 (2- ounce) shot glasses and garnish with lime wedges or citrus of choice. Place in the refrigerator for 2 hours (or overnight) until set.
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