I can understand dirt but not onion

Yes. We have a boy on our hands- he loves to eat dirt. I can understand this infatuation its seems pretty common among the babes.  But then one day he took a bite out of the bar of soap- swallowed it and didn't even flinch. I watch in disgust and thought, 'now that is pushing it a little.' 

However, to top it off, he was screaming at me today as I was chopping raw onions, to give him some. I handed over the raw slice of onion thinking, 'you'll be sorry for screaming at me and you'll see how much you 'really' wanted it.' But he chewed, sucked, swallowed and asked for more. I was  floored.

 SO then I handed him his sippy cup to wash down that onion with his ever so hard to drink milk that he despises,  and he squirms, then gags and spits it back out... and that folks just leaves me speechless. One day he'll learn to love his milk. 

 Do I need to explain this picture or do the teeth marks give it away?

 There is his leftovers from his dirt- but see how he smiles he scrunches his nose. it is to die for.