Rub
1 tablespoon plus 1 teaspoon kosher salt
1 teaspoon freshly ground black pepper
1/4 teaspoon smoked paprika
1/8 teaspoon ground cinnamon

Brisket
1 4-pound trimmed flat-cut brisket with about 1/3" top layer of fat
2 tablespoons grapeseed oil, divided
3/4 cup chopped onion
3 garlic cloves, smashed
4 cups beef broth
1 12-ounce bottle stout
3/4 cup bourbon
1/4 cup (packed) light brown sugar
1/4 cup soy sauce
6 large sprigs thyme
3 celery stalks, chopped
2 plum tomatoes, cored, chopped
1 large carrot, chopped
1 tablespoon balsamic vinegar

Glaze
1/2 cup peach jam or preserves
2 teaspoons bourbon
Kosher salt and freshly ground black pepper