BLW & Allergies

For those of you doing BLW, how do you monitor for allergies if you are just giving baby whatever you are eating? Everything I have read and have been told by my pediatrician is to feed a baby a new food for about 3 days before introducing another one to monitor for allergies. How do you do this?

This is a genuine question not criticizing. I would love to let baby try my food at times but I get nervous.

Thanks!