Rice is notoriously difficult to cook perfectly, even for those with some cooking experience. When it comes to cooking rice on the stove-top, this video reveals that the secret to avoiding mushy rice might be in the way you figure out the water to rice ratios.
If a type of rice calls for a 1:1 ratio of water to rice—one cup to one cup—you’d think that doubling the recipe would just mean you use two cups of each. This video, from the America’s Test Kitchen YouTube channel, suggests that rice-to-water ratios can’t be scaled up proportionally, however, and that it may be why you’re getting mushy rice every time you cook a big batch. What they found with their testing was that evaporation doesn’t double when you double the quantity of rice you’re cooking—it stays the same. So when you double a recipe, you have to account for that evaporation when cook it. Of course, you could always just spring for a nice rice cooker too.
Science: The Secrets of Cooking Rice - The Cause of Recipe Failure is Not What You Might Think | YouTube