Let’s see there are
the fancy bath soaps
the packet of gravy he found in the parking lot at work
the Tom Collins/Chives/pie crust concotion was so disgusting that Homer wouldn’t even eat it
Moon Waffle
The dish soap sample they got in the mail
The rancid shrimp he bought at the Kwik-E-Mart
But the winner in my opinion
The remains of the six-foot sub sandwich that he found behind the radiator
“But I love solids. This is all your fault. Oh, I could never stay mad at you.”
What about the baking soda in the fridge he eats on a bet with Bart? That’s pretty sick, right up there with the sub and the vapo-rub/blood in the Quickie Mart.
When he carried that ball of sugar and caramel around with him that he made with the “Circus Food Wagon Do It Yourself At Home” kit that they actually gave to Marge. Homer snuck down at night and made a huge ball of cotton candy, and caramel (among other stuff, probably) and proceded to eat it for the next few days.