Make a kaffir lime and mint simple syrup by adding sugar, water, lime and mint leaves to a small saute pan over medium-high heat. Bring to a simmer,stir and steep for 5 minutes. Remove simple syrup from heat and cool completely.
Divide mango sorbet into 4 small dishes. Drizzle a small amount of simple syrup over each mango scoop. Top with an optional borage flower.