Fill your glass with ice
Pack a highball glass with ice — cubes or cracked ice both work. A well-chilled glass keeps the drink cold longer and maintains the carbonation of the soda water. If you have a tall Collins glass, that's ideal.
Add rum, mint syrup, and lime
Pour 2 oz of white rum over the ice. Add ¾ oz of homegrown mint simple syrup and ¾ oz of fresh-squeezed lime juice. Stir briefly — about 10 seconds — to combine and start chilling the mixture.
Fresh lime only. Bottled lime juice tastes flat and cooked next to fresh mint. This drink doesn't have enough ingredients to hide it.
Top with soda water
Add 2 oz of chilled soda water — pour it gently down the inside of the glass rather than directly over the ice. This preserves the bubbles. Give one gentle stir from the bottom to integrate.
Garnish and serve
Take a fresh sprig of mint from the garden. Hold it in one hand and slap it firmly against your other palm — this bruises the leaves slightly and releases the aromatic oils without breaking them down. Tuck it into the top of the drink so the leaves sit just above the rim. Add a lime wheel on the side.
The garnish mint isn't just decorative — your nose is over it with every sip. Fresh garden mint here is the difference between a good drink and a great one.
Muddling is a technique, and it's easy to do it wrong. Over-muddle and you break the stems, releasing bitter chlorophyll. Under-muddle and you barely extract any flavour. Mint syrup gives you consistent, calibrated mint flavour every time — and you can taste and adjust before the drink is built. It also lets you prep ahead, which makes a difference when you're making a round for more than one person.