For the curious:

[desperance]

Ten pounds of Seville oranges, plus ten pounds of sugar, plus water to cover, less lossage due to a couple of hours' evaporation while boiling, less the oranges' offal (for only the peel and the pectin remain in the syrup) equals eight and a half kilos of marmalade, as near as calculation can finger it. (And yes, we could totally land a robot on Mars, thank you for asking. And march a Roman mile to a Greek institution, counting steps in Phoenician all the way.)