Made the batter yesterday, tried the dosa maker today : result -- complete success. Far better than any previous attempt at dosa, so if you are a Southern Indian fan, get out to Lidl and snap up one of these before they all go ! The usable diameter of the round flat cooking bed is over 13", far bigger than the base of most frying pans, so ideal for dosa (or indeed for crepes, for which it is really intended).
** Phil (who does /not/ have shares in Lidl !).