No matter which gin and tonic you use, these tips from Whitechapel’s Martin Cate should help ensure perfection. Use a chilled glass and even chill the gin bottle. Measure the amount of tonic, and pour the gin and tonic into the chilled glass before adding ice. Everyone’s glasses are different capacities, so just saying “top with tonic” allows for too much variation. Use a wide double-rocks glass so there’s a larger surface area to enjoy the drink’s bright effervescent aroma.