I have a cookbook at home,called A Thousand Ways to Please A Husband,by Helen Cowles Lecron and Louise Bennet Weaver,published in 1917.They wrote a series of cookbooks.A Thousand Ways to Please A Family,Bettina's Best Desserts,Bettina's Best Salads, When Sue Begins to Cook. Bettina is the main carcheter in their books. The books read like little novels,each chapter has some event going on,and at the end,it gives the menu,and recipes. This is followed in all the books except Bettina's Best Salads and Bettinas Best Desserts.These are just regular cookbooks with recipes.
Sue,is Bettina's Daughter,and When Sue Begins to Cook is a cookbook for children.They revised A Thousand Ways to Please A Husband in the 1930s.
What does this have to do with Washington Pie?Well they give a recipe for it,and theirs has merguine on top.
I'll try to post the recipe for you.
Also,I have a Modern Priscilla Cookbook from the 1920s that has a recipe in it for macaroni croquettes,in other words,deep fried macaroni,will try to post that too.