the most profitable pizza, pizza base + one (literally one) piece of minced tomato, yes you read that right, one “nico” of tomato

that pizza will set you back 0 USD because rounding error, the dough is free (if I remember well) and a bit of minced tomato is less than a rounding error, so effectively zero

then you sell the pizza for the lowest price

customers will hate it, but the price is so good

you don’t even need ice cream anymore

I'm pretty sure you just described Little Caesar's Pizza business model. I recall way back they were $5 but even today here in California their large pepperoni is only $10 where competitors are charging $27-35