I love rhubarb. The crumble in the photo, which I baked this evening, was really good. Do you remember the Laura Ingalls Wilder story about how, as a young bride, she made pie from rhubarb (she called it pie plant) and forgot the sugar? I think Almanzo ate it anyway: just sprinkled some sugar on it.
According to the Larousse Gastronomique, my favorite culinary reference, rhubarb originated in northern Asia. Its first European use was by monks, as a medicinal plant, in the 14th century. This normally impeccable source claims that you can eat the leaves "like spinach" -- totally false -- they're poisonous!
A quick web search turned up the technicalities of this well-known danger: "Oxalates are contained in all parts of rhubarb plants, especially in the green leaves." The stems, explains the website, have a very low level of this toxin. "During World War I rhubarb leaves were recommended as a substitute for other veggies that the war made unavailable. Apparently there were cases of acute poisoning and even some deaths." From The Rhubarb Compendium.
The recipes in the Larousse Gastronomique suggest cutting peeled rhubarb stems into 2 to 3 inch pieces when you make compote, jam, or "English-style" pies and tarts. My mother did it this way, and her rhubarb compote was delicious but full of stringy things around 2 or 3 inches long. I am in the habit of using the food processor to make extremely thin slices of rhubarb -- as shown. This process is very fast, avoids the need to peel the stems, and thus preserves the beautiful red color. Also: no strings! I also pour a kettle of boiling water over the slices to reduce the acidity.
Rhubarb Crumble Recipe
For one 8-9 inch greased pan -- serves 4.
3/4 cups sugar
2 tbs. flour
3 cups sliced rhubarb (wash & slice in food processor before measuring)
A few strawberries, chopped (optional)
Pour boiling water over rhubarb and drain well to remove some of the acid. Beat egg, stir in flour & sugar, and mix with rhubarb. Reserve strawberries for assembly.
NOTE: Rhubarb may be increased to 4 cups, other ingredients proportionally increased.
Combine the following ingredients into crumb-like topping:
4 tablespoons butter
1/3 cup brown sugar
1/2 cup flour
1/2 cup oatmeal
To Assemble and Bake:
Butter the pan and spread the chopped strawberries in it. Place rhubarb filling in pan, and sprinkle topping evenly over the rhubarb. Dot with more butter.
Bake at 350 degrees, 40 minutes.
I bought a lot of rhubarb, and prepped it all at once. While my crumble was baking, I made a pot of compote (AKA rhubarb sauce) from rhubarb, strawberries, and sugar. Cooking the very thin slices goes fast. It was done quite a bit before the crumble. I added a bit of vanilla after cooking. Isn't the color beautiful? We'll eat it later: it keeps in the refrigerator.
Finally, when I open a book like the Larousse Gastronomique, there's no telling what I'll find. Here is an obscure and silly fact: the entry just before rhubarb is rhinoceros, whose flesh "is edible." In fact: "It is preferred," says this revered source, "to that of the elephant by natives who consider hippopotamus meat to be even better." I wonder if that's more accurate than the claim that rhubarb leaves are edible.