Coffee Tonic is espresso on tonic water – bitter, effervescent, without milk. A long drink for the afternoon when the Espresso Martini comes too early and you still want caffeine. The drink lives off the contrast: cold espresso meets the bitterness of quinine, carbonation lifts the aromas. No alcohol, no sugar needed – only if you want to reduce the acidity.
And this is what you need for the Coffee Tonic
4 cl cold espresso
12 cl tonic water
0.5 cl sugar syrup (optional)
Garnish: orange zest strips
The key points
Espresso must be really cold – hot on tonic makes the drink go flat and tastes sour and weird because the carbonation escapes immediately. I brew the espresso in the morning, put it in the fridge and mix it in the afternoon. In a hurry? Pour espresso over ice into a separate glass, strain, then add to the long drink glass. Tonic first, espresso after – this keeps the layers visible and you can watch the aromas mix.
Variations
- Coffee Tonic with gin — add 2 cl London Dry gin to the glass before the tonic – turns the alcohol-free long drink into a bitter highball with juniper.
- Cold brew tonic — instead of espresso, use 4 cl cold brew – less acidity, more body, even smoother finish.
- Coffee Tonic with lemon — instead of orange, use lemon zest – emphasizes the acidity and lifts the quinine note.
Frequently asked questions
Which tonic water works best?
A classic tonic with a clear quinine note – no elderflower, no Mediterranean. The bitterness of the tonic must work with the roast of the espresso, not against it.
Can I use warm espresso?
No. Hot on tonic lets the carbonation escape, the drink goes flat and the acidity becomes unpleasant. Cold or room temperature – not warmer.
Do I really need the sugar syrup?
No. The drink works pure – bitter, dry, refreshing. Sugar syrup reduces the acidity if the espresso is too sharp or the tonic too harsh.
Can I use filter coffee instead of espresso?
It works, but the drink will be thinner. Espresso has more body and roast aromas that stand up to the tonic. Filter coffee disappears faster.
