In a small saucepan, combine the sugar, water and lime juice and heat over medium-low flame, just until the sugar is dissolved.  Remove from heat and allow to cool slightly.

In a martini shaker add the raspberries, strawberries and thyme leaves, reserving 2 raspberries for garnish.  Use a muddler or wooden spoon handle and crush the fruit and thyme.  Fill shaker 2/3 full with ice and add the gin.  Put the top on and shake shake shake.  Strain into 2 glasses and top with tonic water.  Garnish with a raspberry and Cheers!