"Al dente" means "to the tooth" in Italian. (Like "terroir", it's one of those concepts that poorly translates into English.) The phrase refers to the desired texture of cooked pasta, which should be soft but still slightly firm at the core of the noodle (or shell or spiral or alphabet letter). Some cooks define "al dente" as "not hard and not soft."
Pasta cooked "al dente" should require some chewing but not crunch or stick to the teeth when chewed. The firm texture should allow you to taste some of the pasta's flavor. Overcooked pasta tends to be mushy and flavorless.
So how do you know when your pasta is "al dente"? In my house growing up, we threw a strand of spaghetti at the wall -- as soon as it sticks, it's done. The problem with that test is that overcooked pasta sticks to the wall, too. So now I just use my teeth: Before I think it's ready, I draw a piece of pasta from the pot, let it cool a few seconds and take a bite. If it's ready, my mouth knows.
Related: What's the point of putting oil in my pasta water?
Related: How to cook garlic for pasta
Chopping is probably the most common way to prep an onion. Chopped onions show up in anything that needs the basic, earthy pungent flavor that onions give. Chop them larger for longer-cooking dishes like stews and rustic soups, and smaller (call it a dice if you like) for anything from salsas to sauces to ragouts.
To start, cut the onion in half through the root. The root itself will help keep the onion together for chopping
Rotate the onion 90 degrees and cut off the papery end (not the root end). This will make the skin easy to peel away and discard.
Peel back the onion's papery skin. It's often easiest to peel away the first layer of the onion along with the skin.
Make a series of diagonal cuts (roughly 45 degrees) into the side of the onion. Keep more space between the slices for a large chop. Make the cuts closer together for a small chop or a dice.
Now make a series of horizontal cuts to finish shaping the chop or dice.
Finally, rotate the onion again and slice crosswise against the checkerboard pattern you made in the onion. The chopped pieces will fall away from the onion.
