Searching for a way to use all that sorrel? This turned out to be a very good way to do it!
2 c. roughly chopped sorrel
1/3 to 1/2 c. parsley leaves (packed)
2 cloves garlic, chopped
1/4 c. pine nuts (or walnuts, if you prefer)
1/4 c. olive oil
1/3 c. grated parmesan (or more, if you prefer)
1/2 tsp. salt
Combine all ingredients in a food processor and pulse until smooth enough to meet your definition of pesto. The result can be used as a thick sauce for fish, as well as on pasta or veggie pizza.