"Arguable, the best 'o pesto...."
bunch beets (about 1 1/2 lbs.), scrubbed, peeled, and cut into 1” pieces
plus 1 tsp. extra-virgin olive oil
Kosher salt
freshly ground black pepper
Freshly ground black pepper
toasted California walnut pieces (2-oz.), plus ½ c. roughly chopped for garnish (2-oz.)
plus 1 tsp. red wine vinegar
small garlic clove
cooked spaghetti
packed baby arugula
Parmesan cheese, for garnish