Instant yeast

What it is and why it is easy

Instant yeast is a dried yeast milled into fine particles that rehydrate quickly, so it does not need to be bloomed in water first — you can add it directly to the dry flour. That single convenience makes it the default for most modern focaccia recipes.

It is essentially interchangeable in effect with active dry yeast; the difference is method (no blooming) and a slightly faster start.

How much to use

Yeast quantity trades against time and temperature. As a starting point, about 1% of the flour weight (roughly 3 g, or a scant teaspoon, per 300 g flour) suits a same-day focaccia at warm room temperature. For an overnight or cold-fermented dough, cut it well down — 0.2–0.5% — so it does not over-proof while you sleep.

These are small weights, which is exactly why a scale with 0.1 g resolution earns its place: eyeballing a "pinch" is where over- and under-proofing problems begin.

Substituting for other yeasts

To replace active dry yeast with instant, use about 25% less and skip the blooming step. To replace fresh (cake) yeast, use roughly one-third of the fresh weight. Going the other way, if a recipe calls for instant and you have active dry, use a little more and bloom it in some of the recipe’s water first.

Keep salt from sitting directly on the yeast in a dry bowl; mix salt into the flour on one side and the yeast on the other, or the salt can weaken the yeast before it gets going.

Storage and freshness

Unopened, instant yeast keeps a long time in a cool cupboard. Once opened, seal it airtight and keep it in the fridge or freezer, where it stays viable for months. Dead yeast is the number-one reason a dough never rises — if in doubt, proof a little in warm sugared water and look for foam within ten minutes.