Stuffed Eggplant With Walnuts

Name: Stuffed Eggplant With Walnuts
Ingredients: 1/2 cup medium-grind bulgur; Kosher salt; 1/3 cup extra-virgin olive oil, plus more for drizzling; 3 Japanese eggplants, halved lengthwise; 2/3 cup walnut pieces; 1/2 small red onion, roughly chopped; 1 stalk celery, peeled and roughly chopped; 1 clove garlic, smashed; 1 cup packed fresh cilantro; 3 tablespoons fresh tarragon; 1 teaspoon ground coriander; 3 tablespoons white wine vinegar; Freshly ground pepper; 1/4 cup crumbled feta cheese