A question about a recipe: Steamed Scrambled Eggs with Prosciutto Breadcrumbs and Tarragon

I have a question about step 2 on the recipe "Steamed Scrambled Eggs with Prosciutto Breadcrumbs and Tarragon" from amanda. It says:

"Return the food processor bowl to the machine. Add the tarragon and oil and a pinch of salt and puree until the tarragon is finely chopped and emulsified with the oil."

There is no oli listed in the ingrediants. How much oil do you use?