Pesto means paste, and interestingly, so does the word pasta. Pesto refers to a paste of herbs, nuts and oil used to flavor foods. Pasta refers to the dough or paste used to make spaghetti, rigatoni and other dried and fresh pastas.
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Cooked homemade pasta with egg has 74 calories per 2 oz. serving, measured after cooking. Made without eggs, cooked homemade pasta such as lasagna noodles or ravioli wrappers has 71 calories per 2 oz. serving. Commercial dry pasta such as spaghetti has 211 calories per 2 oz. serving, before cooking.
A classic pesto sauce made with 2 tbsp. chopped walnuts or pine nuts, 2 cloves of garlic, 3 tbsp. olive oil, 4 cups of basil leaves, 1/2 cup of grated Parmesan cheese and salt has 45 calories per serving. This recipe makes 16 servings, about 1 1/2 tbsp. per serving.
A serving of pasta is 2 oz., according to package labels. However, many people actually eat 4 oz. of pasta in a serving. Four oz. of pasta and 3 tbsp. of pesto sauce would have a total of 510 calories.