I will echo Addie, dry is not something to be concerned about. I will say it generally stems from overcooking, New cooks kind of tend to put too much on a recipe, heat wise, just to make everything fully cooked. It leads to dry recipes.
OK so your major thing is figuring out this pudding. First of all, find some cheesecloth, that might take some time. A pudding, particularly as it is your grandmothers, which assuming you are 18-30, puts us back on recipes quite some time. Do you have the ingredients? Pudding in early America, or Vicky England could be savory or sweet.
I'd ask do you have a recipe? If not have you eaten it an how do you describe it?
sourdough isn't a recipe, it is a process.