3/4 oz Mint Syrup (*)
1 1/4 oz Pimm's No. 1
3/4 oz Lemon Juice
Shake with ice and strain into a Collins glass containing 2 oz soda water. Top with crushed ice and garnish with a mint sprig and borage flowers. Floating a barspoon of funky Jamaican rum like Wray & Nephew or Smith & Cross would not be out of place here (originally intended but left out of this drink of the day recipe).
(*) Here, a tea made from a steep with hot simple syrup, but muddling mint sprigs in simple syrup and straining will work well.