Tanzanian vs Kenyan coffee for iced coffee: which to buy

Buy No. 4 Conjuncture (Kenya) for iced coffee. Its orange and lemon notes are the kind that still read through melted ice, and the roaster says it is acidic on purpose. Pick No. 9 Optimism (Tanzania) only if you want a softer, floral glass and plan to drink it quickly, because the roaster notes it flattens faster than our other coffees as it cools.

Both are fully washed and dried on raised beds, so the difference is mostly origin and varietal. That makes this a fair side by side. Everything below comes from the label, plus the standard flash brew method for the ice.

Tanzanian vs Kenyan: what does the label say?

The one thing the roaster says about cooling is on Optimism: drink it while it is hot, because it flattens faster than the others. Iced coffee is the opposite situation, so we would not reach for it first. Conjuncture comes with no such warning, and the roaster says its acidity is deliberate.

Why does acidity matter for iced coffee?

Ice does two things to a cup. It lowers the temperature, which dulls sweetness, and it dilutes the coffee as it melts. A cup with bright citrus notes keeps something to hold on to. A cup built on soft fruit and florals can end up tasting like lightly flavored water by the last third of the glass.

That is the reasoning, not a roaster claim. We have no data on how either bag tastes iced beyond the label, so take it as a starting point and adjust to your own palate. If you want to know what each tastes like hot first, see No. 4 Conjuncture, cup by cup and No. 9 Optimism, cup by cup.

How do you brew each one over ice?

Use flash brew: brew hot and strong directly onto ice, so the coffee chills in seconds and keeps its aroma. For one tall glass (roughly 12 oz of finished drink), the same base recipe works for both coffees.

1. Put 130 to 150 g of ice in the carafe or a heatproof jug.
2. Weigh 25 g of coffee. Grind a touch coarser than your hot pour-over setting.
3. Heat water to 94 °C (201 °F) for Conjuncture, or 93 °C (200 °F) for Optimism.
4. Pour 250 g (about 8.5 oz) of water in slow circles, in stages, over about 2:30 to 3:00.
5. Swirl, then pour over a glass of fresh ice.

Two adjustments. If Conjuncture tastes sour rather than bright, the roaster's own advice is to grind finer. If Optimism tastes thin, use 27 g instead of 25 g, and drink it soon after it is made. Our full hot recipes are in the No. 4 Conjuncture brewing guide and the No. 9 Optimism brewing guide. For a worked iced example with another coffee, see iced No. 8 Consent.

Which one should you buy?

Start with Conjuncture if your iced coffee is the one you drink slowly on a warm afternoon, because it should hold its character longer. Choose Optimism if you drink your iced coffee in ten minutes and like pear, jasmine and strawberry as the notes. If you are unsure, the all ten coffees page lists the rest, and a subscription (11% off, skip or cancel in one click) lets you switch between bags.

What should you change if the glass tastes off?

Flash brew has three levers: grind, ratio and ice. If the glass tastes sour or sharp, grind finer so the water pulls more out of the coffee before it hits the ice. If it tastes harsh or drying, grind coarser. If it tastes watery by the end, cut the ice in the glass first, then raise the dose by a gram or two. Change one thing per brew, and write down what you did, because a glass of iced coffee is easy to remake and hard to remember.

Use a clear ice that is not full of freezer smells. Coffee picks up flavor from old ice faster than most people expect, and it is the cheapest fix in the whole recipe. If you pour over ice in the carafe, wait for the last of the water to drip through before you swirl, because the final drips are the thinnest part of the brew and the ice will even them out.

Can you make cold brew with them instead?

You can, though we have no roaster guidance for it and will not invent any. Cold brew is a different extraction, slower and gentler, and our cold brew vs iced coffee post explains how the two differ.