Another recipe of grandmother’s that used Spry vegetable shortening (which I’ve commented on here, in addition to comments on Spry’s equivalent, Crisco, here), which was very much the method of cooking at the time. You can substitute with butter.
See grandma’s list of oven temperatures to find out the correct setting for a moderately hot oven.
This Baked Chocolate Pudding is unique because it has a meringue topping, very similar to these other recipes I’ve found on the internet here and here.