Now, I know what you're thinking, "5-7 minutes, that's a pretty wide range". And you're right, it is! But, that's what makes cooking so much fun, right? The trial and error, the experimentation, the possibility of discovering something new and amazing.
Think of it like brewing the perfect cup of coffee - you need to find the right balance of coffee to water, and the right amount of time to steep. It's all about tweaking the variables until you get it just right.
And, let's be real, practice makes perfect. The more you cook, the more you'll develop your own sense of intuition in the kitchen. You'll start to know, just by looking at those Brussels sprouts, whether they're done or not.
Preparing Brussel Sprouts For Boiling at Sheila Cline blog