Drop 1/2 teaspoon of the rose petals into a highball or Collins glass, fill the glass with ice, then add the remaining 1/2 teaspoon rose petals. Pour in the tonic water, then the gin, then the rosewater, and top off with a bit more ice. Make a slice in the strawberry from the pointed end almost to the root, and balance the strawberry on the rim of the glass.
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