Mushroom, Spinach, and Brown Rice Loaf

brown rice, dry

olive oil

large yellow onion, chopped

garlic cloves, minced

celery ribs, chopped

Kosher salt

Freshly ground black pepper

crimini mushrooms, stems removed, sliced thin

fresh tarragon, chopped

fresh spinach

sun dried tomatoes, chopped

eggs, whisked

Dijon mustard

vegetable broth