To prepare a the rocket recipe, you will first need to gather your ingredients. You will need: 2 tablespoons of olive oil, 1 tablespoon of butter, and 1 teaspoon of kosher salt. Mix the ingredients together until they are well combined. Pour the mixture into the frying pan and cook over medium-high heat until the butter is melted. Remove the pan from the heat and stir in the chopped parsley.