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To make the pesto, in a food processor, add the basil, garlic, nuts, and salt.
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Pulse a few times to chop the basil leaves, nuts, and garlic.
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Add the balsamic vinegar.
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With the machine running, slowly drizzle in the olive oil until the pesto comes together and looks like a nice wet sauce. Using more or less oil as needed.
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Store pesto in an airtight container in the fridge for up to one week. Makes about 1 cup.
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Use the rest of the ingredients to build your sandwich.
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Spread hummus on one slice of bread.
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Spread balsamic pesto on the other.
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Vegetables in the middle.