Coring an Apple One Half at a Time
1. Put the apple on a cutting board. The stem should be facing up.
2. Cut the apple in half. Use a sharp knife to halve it from top bottom.
3. Use a small spoon or melon baller to scoop out the seeds and fibrous sheathes of each half of the apple.
4. Use a knife to remove the stem and bud ends of the apple. The core should be completely removed.
You can slice the apple further if it's necessary.
Note that you can also do the same process if you cut the apple into fourths, instead of halves, first.