Making the bombe:
Although this work of art is quite simple, it does take some time to create,
Start by making the brownies as they'll need to cool before you lining the bowl
I used the following recipe and was quite satisfied.
Vegan Brownies (from All Recipes)
2 cups white flour
2 cups white sugar
3/4 cup cocoa powder
1 tsp baking powder
1 tsp salt
1 cup water
1 cut vegetable oil
1 tsp pure vanilla extract
Come dry ingredients, then add wet ingredients
Pour into 8x11 in pan (greased) and bake at 350 degrees for 25 minutes
In addition to the brownies, you'll need about 8 cups (depending on the size of your bowl) of your favorite vegan ice cream. Two kinds with contrasting colors will look the coolest. I recommend anything from Turtle Mountain; Purely Decadent.
Once the brownies have cooled, line a small metal bowl with plastic. Cut a brownie square big enough to cover the bottom of the bowl and then transfer the square to the bowl, taking care not to break the brownie square. Press the brownie lightly against the bowl. Use about 1/2 of the brownies to cover the rest of the interior of the bowl and then put the bowl in the freezer for about 20 minutes or until the brownie wall is slightly frozen.
Using about half the ice cream, cover the brownie walls, making sure not to go over the edges. Return the bowl to the freezer for about 15 minutes.
Then using the remaining brownies, line the ice cream wall with brownie. The take the other ice cream and use it to fill the center.
Cover the bowl with a plate and return to the freezer for a few hours, until frozen solid.
When ready, invert the bowl on a cutting board and gently tug at the plastic to remove the bombe from the bowl.