Carrot Tart with Ricotta and Herbs

Name: Carrot Tart with Ricotta and Herbs
Cuisine: European, Mediterranean
Ingredients: 2 cups ricotta; 1/4 cup heavy cream; Kosher salt, freshly ground pepper; 3 tablespoons olive oil, divided; 1 small onion, thinly sliced; 4 large carrots (about 8 ounces), scrubbed, thinly sliced into coins; 1 package frozen puff pastry, thawed; 1 large egg, beaten to blend; 1/2 cup coarsely chopped fresh chives; 2 tablespoons small dill sprigs