“Make sure they're cooked all the way through.”

Your husband cooked pork chops for dinner. You're worried that they might not be cooked enough, so you tell him:

Make sure they're cooked all the way through.

make sure (clause)

To "make sure" means to check something again, so that you know that it's OK. When you want something to happen and it's important, you check to "make sure" that it happens. For example, before your house guests leave, you can tell them:

Make sure you've got everything.

A more formal version of this phrase is "make sure that (clause)":

Make sure that the pork chops are cooked all the way through.

cooked all the way through

When you cook thick food like American-style steak or pork chops, sometimes the outside of it gets cooked while the middle is still raw. When this happens, you say that it's "not cooked all the way through". When something is cooked all the way through, that means it's done on the outsides and in the middle.

Another way to say this is "completely cooked" or "cooked in the middle".