OK, this is a basic question, but considering my bad track record with pesto, I want to make sure. Would a 1/4 cup whole toasted walnuts be a good substitute for the 3 tbsp pine nuts called for in Marcella Hazan's pesto recipe below? Or would I need more considering how bulky walnuts are and how few can fit in a 1/4 cup? I'd like to avoid pine nuts due to the pine mouth problem. Thanks! Ingredients 2cups tightly packed fresh basil leaves ½cup extra virgin olive oil 3Tbsp. pine nuts 2garlic cloves, chopped fine before putting in the processor ~Salt 1/2cup freshly grated parrmigiano-reggiano cheese 2Tbsp. freshly grated romano cheese 3Tbsp. butter, softened to room temperature Steps Briefly soak and wash the basil in cold water, and gently pat it thoroughly dry with paper towels. Put the basil, olive oil, pine nuts, chopped garlic, and an ample pinch of salt in the processor bowl, and process to a uniform, creamy consistency. Transfer to a bowl, and mix in the two grated cheeses by hand. It is worth the slight effort to do it by hand to obtain the notably superior texture it produces. When the cheese has been evenly amalgamated with the other ingredients, mix in the softened butter, distributing it uniformly into the sauce. When spooning the pesto over pasta, dilute it slightly with a tablespoon or two of the hot water in which the pasta was cooked. Freezing pesto: Make the sauce through to the end of Step 2, and freeze it without cheese and butter in it. Add the cheese and butter when it is thawed, just before serving.