You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Preheat the oven to 400F. Grease an ovenproof dish. Heat 1 tbsp oil in a saucepan and fry the beef for 15 mins, until crumbly, adding the carrots, celery and half the onion after 5 mins.,______,To make the bechamel sauce, melt the butter in a separate saucepan, add 2 tbsp flour and cook, stirring, for 2 mins. Gradually add the stock and milk, stirring constantly. Bring to a low boil and simmer for 5 mins. Season with salt and black pepper.,Heat 1 tbsp oil in a separate saucepan and fry the garlic and remaining onion for 2 mins. Add the spinach, cover and cook until wilted. Season with salt and a pinch of nutmeg.,Spread 2 tbsp beef sauce in the bottom of the dish. Spread over the spinach. Spoon the remaining beef sauce into the cannelloni and arrange on top of the spinach. Pour over the bechamel sauce. Arrange the tomato slices on top and sprinkle over the cheese. Bake for 40 mins. Serve garnished with the reserved thyme.
Output:
Stir in the tomato puree and sprinkle in 2 tbsp flour. Cook for 2 mins, then pour in the wine. Add the tomatoes, breaking them up roughly with a wooden spoon. Add the thyme and season with salt and black pepper. Bring to a boil and simmer for 10 mins.