Place the celery, celery leaves, parsley, arugula and garlic cloves, in a food processor and pulse until coarse. Add nuts and pulse a couple of times. Drizzle in the olive oil continuing to pulse until a loose sauce begins to form. Add salt and pepper to taste. Stir in the cheese.
Store in an airtight container in the refrigerator with a light cover of olive oil for up to 5 days, or freeze in individual airtight containers for up to two months.
Brown the bread slices in olive oil and drain on paper towels.
Spread some of the pesto mixture on each slice and place on serving dish.
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