What is OISELLE which used in some recipes?

"Oisselle" is not a common culinary ingredient, and it's likely a misspelling. It's possible you're referring to one of the following:

* "Oseille": This is the French word for sorrel, a leafy green with a tart, lemony flavor. It's used in various dishes like soups, sauces, and salads.

* "Oeuf": This is the French word for egg.

* "Oseille" is a popular brand of French yogurt, particularly known for their organic and dairy-free options.

Could you please provide more context about the recipe and where you encountered this term? That might help me pinpoint the exact ingredient you're looking for.