Brown Sugar Syrup

Before you start

Brown sugar syrup gets its deep caramel and molasses taste from dark brown sugar, simmered just long enough to dissolve and thicken slightly. It is the backbone of brown sugar boba drinks and an easy way to make iced coffee taste like a café drink. The same recipe makes two textures: a short simmer gives a pourable coffee syrup, and a few more minutes reduces it to the thicker syrup that clings to the inside of a boba cup.

The main thing to watch is heat. Brown sugar contains molasses, which scorches more readily than white sugar and turns bitter. Keep the heat moderate, stir, and pull it off once it coats a spoon. It thickens a lot more as it cools.

Ingredients

• 200 g (1 packed cup) dark brown sugar
• 150 ml (5 oz) water
• 1 small pinch fine salt
• ¼ tsp vanilla extract — optional

Method

1. Combine the brown sugar, water and salt in a small saucepan over medium heat. Stir until the sugar dissolves, about 2 minutes.
2. Bring to a gentle simmer, with small bubbles across the surface. For a pourable coffee syrup, simmer 2 minutes more and remove from the heat.
3. For a thick boba-style syrup, keep simmering for 4 to 5 minutes total, stirring often, until it coats the back of a spoon and a line drawn through it holds briefly. Watch for a burnt smell and lower the heat if the edges darken quickly.
4. Remove from the heat and stir in the vanilla.
5. Cool for about 20 minutes, then pour into a clean jar and refrigerate.

Tips for success

• For iced coffee, start with 15 to 20 ml (½ to ¾ oz) per 240 ml (8 oz) drink and adjust.
• For brown sugar boba, warm the cooked tapioca pearls in a few spoons of the thick syrup for a minute so they absorb flavor, then swirl the syrup up the inside of the glass before adding ice and milk.
• Cold syrup is stiff. Warm the jar in a bowl of hot water for a few minutes if you need it to pour.

Substitutions

Dark brown sugar

Light brown sugar gives a milder caramel flavor. Muscovado is deeper and more bitter-sweet; Okinawan kokuto, if you can find it, tastes rich and mineral.

Water

Use strong brewed coffee in place of some or all of the water for a coffee syrup that adds flavor without extra dilution; refrigerate and use within 2 weeks.

Vanilla

A cinnamon stick simmered in the syrup gives a spiced version for chai lattes; leave it out for plain boba.

Variations

Brown butter brown sugar

Brown 1 tbsp butter in the pan before adding the sugar and water. Refrigerate and use within 1 week.

Salted brown sugar

Increase the salt to ¼ tsp for a salted-caramel-style coffee syrup.

Troubleshooting

It tastes bitter or burnt

The heat was too high and the molasses scorched. Start again over medium heat, stir constantly and keep the simmer gentle.

It set too thick in the fridge

It was reduced too long. Warm it with a tablespoon or two of water, stirring until loose, then cool.

It crystallized

Stray sugar on the pan sides seeded crystals. Rewarm with a splash of water until clear and avoid stirring after it boils.

Storage

Refrigerate in a clean, covered jar for about 2 to 3 weeks; the reduced boba-style syrup keeps toward the longer end. Discard if it smells off, looks cloudy or grows mold. Bring to room temperature or warm gently before use.