FE Souffle Dish, Stoneware Ramekins Set of 6, 240 ml Rome Pillar Creme Brulee Dishes For Dipping Sauces, Pudding, Ice Cream, Classic Style oven safe bowl(Grey)

Q: Do these christmas pudding bowls nested for saving space?

yes, these nut bowls is stackable.

Q: can i use this it in the instant pot?

it hasn’t been an issue, because they are easy to stack, actually i had used them in my instant pot.

Q: Can i use this to steam pudding or custard?

these 8 oz ramekins are suitable for your need, whatever pudding or custard or other desserts, generally i put the ramekin in the ovenproof pan, then, add some water to constant gentle heat. i advise you to steam the pudding with some sort of water, so they won't overheat or crack.