[mordechai9000]

I would make them fairly small (personal pie-sized) and use a filling that doesn't need to be cooked in the oven to set. The main limiting factors, I think, would be structural integrity and heating the filling to the center. You could set it on a ring (like the rim of a spring-form pan) to support it better during cooking. Now, a four dimensional hyper pie, on the other hand...

[_aavaa_]

If you’re not cooking the filling, then do a teflon ballon that you put the crust on. Cook. Remove balloon. Then pipe in ready to ready to set chocolate cream.

[hinkley]

One of those spherical ice cube makers but made of cast iron, a little like those little waffle makers.

[_aavaa_]

I don’t think those will work, you want the outer surface to be crispy. The dough’s gotta go on the outside of the sphere.

[reactordev]

I would bake it on a pizza stone to ensure an even bake.

Has nobody here ever done this? It comes out perfectly cooked.

[raddan]

You cook a spherical pie on a pizza stone? Do tell.

[reactordev]

I cook a circular pie on a pizza stone.

[thatguy0900]

If we don't care what the filling is you could just use sticky rice.