Harissa Carrot Dip

Name: Harissa Carrot Dip
Ingredients: 1 1/2 pound (about 7 or 8) medium carrots, scrubbed (no need to peel); 1 head garlic; 2 tablespoon plus 1 teaspoon extra-virgin olive oil, divided, plus more for serving; 3 tablespoon harissa (any heat level), divided; Kosher salt; Freshly ground black pepper; 3/4 cup raw cashews, rinsed; 1 cup boiling water; 1/2 tablespoon lemon zest (from about ½ lemon); 1 1/2 tablespoon lemon juice (from about ½ lemon); Flaky sea salt, for serving; Fresh vegetables, such as endive, radicchio wedges, watermelon or red radish slices, or sliced fennel, for serving; Mixed seedy crackers, potato chips, or sliced flatbread, for serving