GARLIC SCAPE PESTO

1 cup garlic scapes (about 8 or 9 scapes), top flowery part removed, cut into ¼-inch slices
1/3 cup walnuts
3/4 cup olive oil
1/4 - 1/2 cup grated parmigiano 
1/2 teaspoon salt
black pepper to taste

Place scapes and walnuts in the bowl of a food processor and whiz until well combined and somewhat smooth. Slowly drizzle in oil and process until integrated. With a rubber spatula, scoop pesto out of bowl and into a mixing bowl. Add parmigiano to taste; add salt and pepper. Makes about 6 ounces of pesto. Keeps for up to one week in an air-tight container in the refrigerator.