Paula Wolfert's Herb Jam with Olives and Lemon

Ingredients

4 large garlic cloves, halved

1 pound baby spinach leaves

1 large bunch flat-leaf parsley, stems discarded

1/2 cup celery leaves, coarsely chopped

1/2 cup cilantro leaves, stemmed

1/4 cup extra-virgin olive oil

12 oil-cured black olives, pitted, rinsed, coarsely chopped

1 1/4 teaspoon Spanish sweet smoked paprika (pimenton de la Vera)

Pinch of cayenne

Pinch of ground cumin

1 tablespoon lemon juice, or more to taste

Salt and freshly ground pepper