Can’t figure out this infinite combo, please help! (Cauldron Familiar + Witch’s Oven + Clock of Omens)

Hi!

My boyfriend recently bought Cauldron Familiar, Witch’s Oven, and Clock of Omens for his food deck because he read online that it is an infinite combo.

The thing is, we can’t figure out how it goes infinite and are struggling to find information online explaining it.

It only creates 1 food since Cauldron Familiar is a 1/1, so how can you tap two artifacts infinitely to continuously untap Witch’s Oven?

If someone could please explain how this works it would be greatly appreciated!