Ethan Chlebowski did a video on rice in youtu.be/IjjdAheuNKs where he cooks rice sous vide to determine water ratios and cook times. There are more details in the companion blog post at cookwell.com/…/rice-cooking-fundamentals-4-method…
For brown rice in an on/off rice cooker, try doing 1:1 + 0.5 cups of water for evaporation.
TL;DR/W: When cooking different types of rice sous vide, they all absorb water in a 1:1 ratio. The only difference is how long it took to cook through (white long grain is less than brown or wild, for example).
So, the deciding factor is how much the cooking method evaporates water in that time. Sous vide can’t evaporate water, so it’s still 1:1 but other methods need more water. Rice cookers are pretty consistent, so it’s easier to calculate the additional water for evaporation. For white rice, it’s about 0.25 cups for evaporation while brown rice needs about 0.5 cups for evaporation because it cooks longer.
There are more details in the video/blog post about other methods, like boiling rice similar to pasta
starik@lemmy.zip 1 day ago
They turn off when they get above 100C, when all the water is absorbed/evaporated.
M137@lemmy.world 1 day ago
Not sure what your point is here, but as per the other replies to this comment that just doesn’t work well for all different kinds of rice. So my completely uninformed thoughts right now are that brown rice needs a longer time with hot water to get to the point we consider cooked. The way a rice cooker works, if they all do like you’ve said, makes the water evaporate too quickly so it it doesn’t get enough time to get into the core of the rice kernels of some kinds. And I’m sure it’s too much for other kinds where you end up with overcooked, too sticky or even like porridge, rice.
PaintedSnail@lemmy.world 14 hours ago
youtu.be/RSTNhvDGbYI
Kolanaki@pawb.social 8 hours ago
Exactly. The brown rice won’t be cooked all the way before the water is evaporated.