Cut the basil shortly before using. Otherwise, the fragile herb turns black as it sits.
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Cook the spaghetti according to package instructions in a pot of well-salted boiling water.
Meanwhile, to a large bowl, add the olive oil, tomatoes and 1/2 teaspoon salt. Let sit until the spaghetti is done cooking.
Add the drained spaghetti to the bowl along with the basil and mix well. Serve.