Tomatoes stop beans/quinoa from absorbing water?

[pulykamell]

Salt is fine. I soak my beans all the time in salted water, and it works a treat to season them. Cite:

For the best, creamiest, most flavorful beans, season your bean-soaking water with one tablespoon of kosher salt per quart (about 15 grams per liter), rinse the beans with fresh water before cooking, then add a pinch of salt to the cooking water as well.

As for tomatoes, I’ve never noticed a difference myself.