When trying to explain injection molding to a non-industrial-designer, I often use the example of a waffle iron. While the kitchen gadget doesn't have sprues, it's generally enough to get the idea across. It also helps people understand parting lines and flashing.
But the thing about a waffle iron is, you can't change the tooling. You get just one shape of waffle. I never thought about that until I came across this Presto Belgian Waffle Bowl Maker, by American kitchen gadget brand National Presto Industries. You can see what it does:


I don't even eat waffles, yet I kind of want one of these.


They run $42.
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A quick search for "waffle maker interchangeable plates" seems to find a few companies that make flat waffle makers with interchangeable tooling. Give it time and Dash might make a bowl shaped one.