Watercress can be used in place of rocket, if you like, as it has a similar peppery flavour. Or try a mix of both.
For a more pronounced lemon flavour add 1 teaspoon finely grated lemon zest or 50g drained and chopped preserved lemon.
Don’t just dip! Make a delicious pasta salad by stirring a few spoonfuls of the guac into cold cooked penne pasta along with an extra squeeze of lemon juice. Add flaked poached salmon fillet and cooked peeled prawns, if you like.