We simply call this "green sauce" in our house and I make some variation of it throughout the year. In summer I use basil, capers and jalapeno; autumn and spring include watercress from the clean stream nearby, and this winter version has wholegrain mustard for extra punch.
Ingredients
Large bunch of parsley, about 80-100g
1-2clovesof garlic, peeled and roughly chopped
1tspwholegrain mustard
1tspcapers
2gherkins, roughly chopped
1tbspwhite wine vinegar
1tbsplemon juice
About 100ml extra virgin olive oil
Instructions
Place all the ingredients except olive oil into a food processor and blitz into a rough paste. With the engine going, drizzle in the olive oil until a thick green sauce is achieved. Check the flavour, adding extra lemon juice if needed. Pour into a jar and store in the fridge. Use within 1 week.