Gray says in the 20^th century, people became more urbanized and squeamish, abandoning rich dishes such as bone marrow tart, made with almonds, cream, rosewater, candied fruit, chicken and marrow in puff pastry. But the habit also died, Gray says, because – as we've previously reported on The Salt — World War I and World War II took a heavy toll on the culinary skills in British middle- and upper-class kitchens: "Quite a lot of [these offal recipes] require a lot of cooking and processing," Gray says. "So when you start to lose a lot of servants during wartimes, it becomes more difficult. The skill level declines, because people only cook with the ingredients they have access to."

Incredibly Expanding Eggs: Some recipes call for as many as 30 eggs to bake a cake; others suggest whisking for an hour. But if you were to try out these recipes today, you'd need to use just two-thirds or even one-half of the eggs indicated, Gray says, because eggs have grown larger over the last century. As eggs began to be classed by quality and weight, farmers culled smaller chickens in favor of larger ones that produced bigger eggs.

Even in 1940, Gray says, egg cups were much smaller than they are today, indicating a gradual change. While whisking for an hour sounds like a workout, modern machinery didn't exist in the Georgian period, and with servants to do it, women running a household wouldn't have minded. Gray says she has actually whisked eggs for a full hour, and it does make a difference in texture. So if you have servants to do it, why not?

Recipes From The Cookbook Of Unknown Ladies

'An Oyester Pye:' This recipe shows how the relative price of ingredients has changed. In the 18th century, people from all levels of society enjoyed oysters. This recipe for an oyster pie calls for 100 oysters.

"Take an hundred of the largest oysters you can get. Wash them, when opend, in [...] warm water. Strain all ther own liquor and put ye water yow wash ye oysters in likewise. Cut two large sweet breads in small bits. Have an half hundred bouled chesnuts peeled, six yolks off hard eggs, two anchovys shred, some lumps of whole marrow. Intermix all these in ye pye. Pour on ye liquor & a water glass full of white wine. Fill ye pye with what liquor it wants, with greawy. If you have not marrow, put in butter. Seasone it with salt, mace and cloves."

'To Make a Spineage Tort:' Sweet spinach tart – a surprising combination of sweet and savory ingredients. This recipe has been largely forgotten in Britain, but a very similar dish is still made in a parts of Provence during the Christmas celebrations. This would be served as a second course.

"Take 6 eggs, yolks & whites. Beat them well with a pint of sweet cream, a qr of a pd of crums of bread, a good handfull of spinage cut small, half a qr of currons, half a qr of almonds pounded wth a little rose water, half a nutmeg, half a pd of white sugar. Half a pound of drawn butter, 3 spoonfulls of brandy. Mix all well together. Lay paist thin at the bottom & sides of the dish & cross bar at top. 3 qrs of an hour bakes it."

'Lemmond Cream:' This recipe for lemon cream was a favorite with the Cooking Up History volunteers who gave it a test run.

"To four large lemmons squeesd put 3 qrs of a pd of the finest loaf sugar, 8 or 9 spoonfuls of water & a piece of the peel. Set it over the fire untill the sugar tis melted. Put in the whites of 4 eggs & strain it through a diaper napkin, doubled. Sett it on ye fire a gain & stir it all ye while. When it grows thick, take it off. Put in two spoonfuls of orange flower water. Lay some shreds of boiled lemmon peel at the bottom of the glasses."

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Three Ways Cooking Has Changed Over the Last 300 Years