Tonka Bean Old Fashioned

The Old Fashioned is the oldest recipe in the cocktail canon and also the one most frequently overthought. At its core it is three things: spirit, sweetener, and bitters. Everything else is decoration.

This version replaces the standard demerara or simple syrup with a tonka-kola syrup that changes the character of the drink considerably. Tonka bean brings vanilla and almond — a warm, slightly exotic sweetness that plays well against aged whiskey. Kola nut brings bitterness and a faint earthiness that does some of the work Angostura bitters normally do alone. Together they build a syrup complex enough that the drink doesn't need orange or any additional garnish to feel complete.

function tonkaBeanOldFashioned() {
  return {
    name: 'Tonka Bean Old Fashioned',
    glass: 'Rocks glass with large ice',
    method: 'Stir',
    ingredients: [
      { ingredient: 'Bourbon', amount: '2 oz', note: 'Four Roses Small Batch' },
      { ingredient: 'Tonka-kola syrup', amount: '¼ oz', note: 'Recipe below' },
      { ingredient: 'Angostura bitters', amount: '1 dash' },
      { ingredient: 'Luxardo cherry', amount: '1', role: 'garnish' },
    ],
    instructions: [
      'Combine bourbon, syrup, and bitters in a mixing glass.',
      'Add ice and stir for 30 seconds until well chilled.',
      'Strain over a large ice cube in a rocks glass.',
      'Garnish with a Luxardo cherry.',
    ],
  }
}

function tonkaKolaSyrup() {
  return {
    yield: 'Approximately 100ml. Keeps refrigerated for up to 3 weeks.',
    ingredients: [
      { ingredient: 'Water', amount: '75g' },
      {
        ingredient: 'Demerara sugar',
        amount: '75g',
        note: 'Sugar in the Raw works well',
      },
      { ingredient: 'Tonka beans, coarsely crushed', amount: '6g' },
      { ingredient: 'Kola nuts, coarsely crushed', amount: '5g' },
    ],
    instructions: [
      'Combine all ingredients in a small saucepan.',
      'Bring to a simmer over medium heat, whisking to dissolve the sugar.',
      'Remove from heat, cover, and steep for 1 hour.',
      'Strain through a fine-mesh strainer or chinois.',
      'Transfer to a glass bottle and refrigerate.',
    ],
  }
}

Glass: Rocks glass with large ice — Method: Stir

Ingredients

  • 2 oz Four Roses Small Batch
  • ¼ oz tonka-kola syrup (recipe below)
  • 1 dash Angostura bitters
  • Luxardo cherry (garnish)

Instructions

  1. Combine bourbon, syrup, and bitters in a mixing glass.
  2. Add ice and stir for 30 seconds until well chilled.
  3. Strain over a large ice cube in a rocks glass.
  4. Garnish with a Luxardo cherry.

Tonka-Kola Syrup (makes ~100ml, keeps 3 weeks refrigerated)

  • 75g water
  • 75g demerara sugar (Sugar in the Raw works well)
  • 6g tonka beans, coarsely crushed
  • 5g kola nuts, coarsely crushed
  1. Combine all ingredients in a small saucepan.
  2. Bring to a simmer over medium heat, whisking to dissolve the sugar.
  3. Remove from heat, cover, and steep for 1 hour.
  4. Strain through a fine-mesh strainer or chinois.
  5. Transfer to a glass bottle and refrigerate.

On the syrup

The tonka bean is doing the heavy lifting here. It has a profile that doesn't map cleanly onto anything else — part vanilla, part almond, part something you can't quite name — and it gives the syrup a warmth that plain demerara doesn't have. The kola nut adds bitterness and a slightly earthy note that fills in the bottom of the drink.

Crushing the beans coarsely matters. Too fine and the steep gets muddy; too whole and you lose surface area. A few firm cracks with the flat of a knife or the bottom of a pan is the right level of preparation.

The steep time is worth honoring. An hour gives the flavors time to fully integrate without the syrup tipping into astringency.

On the bourbon

The syrup's vanilla character makes a natural case for bourbon over rye. Four Roses Small Batch is the call here — it's built on a high-rye mash bill that keeps it from going too sweet, but the entry proof and the house yeast strains give it a floral, fruity quality that pairs well with the tonka bean. It doesn't fight the syrup. It works with it.

Rye works if you want the drink drier and spicier, but the tonka-kola syrup is rich enough that a high-rye mashbill without the right balance can tip the drink toward bitter without the sweetness to hold it. Four Roses threads that needle.

On the bitters

One dash rather than two. The kola nut in the syrup is already carrying some of the bitterness that Angostura normally handles alone, and two dashes can push the drink into a more austere register than the tonka deserves. Taste after one dash. Add a second only if the drink feels flat — and with good bourbon and this syrup, it won't.