To make pesto with parsley you basically follow the same recipe you'd use for basil pesto (with one important substitution). This pesto is great with fish, chicken, or in pasta. As always, prepare it "to taste" -- fiddle with the quantities until it tastes right to you!
1 cup Italian (flat-leaf) parsley
1 tsp lemon juice
1/4 cup pine nuts, toasted
1/4 cup grated parmesan cheese
1 garlic clove, minced
1 Tblsp olive oil
salt to taste
Puree in food processor until smooth.