Rinse the herbs and salad leaves in cold water and gently pat dry in a clean tea towel.
Mince the garlic either using a garlic press or by finely chopping with a knife and grate the parmesan if you haven't already done so.
If using a blender gently tear the herbs and add to the blender (stalks and all!) along with the garlic, olive, parmesan, lemon juice and seasonings.
Pulse until the ingredients resemble a chunky, but not totally smooth, paste.
If making the pesto by hand, finely chop the herbs and leaves and then mix in a bowl with all the other ingredients. You could also use a pestle and mortar but I find this doesn't work as well as I would like on the parsley.
Taste your pesto and add more garlic/lemon/salt and pepper as desired.