Preheat the Oven: Preheat your oven to 400°F (200°C).
Prepare the Lemon-Herb Mixture: In a 9x13-inch casserole dish, whisk together the vegetable broth, olive oil, lemon juice, chopped dill, Dijon mustard, grated garlic, dried oregano, salt, and pepper.
Add the Potatoes: Add the potato wedges to the casserole dish and toss until evenly coated with the lemon-herb mixture.
Arrange the Lemon Slices: Arrange the lemon slices over the potatoes.
Bake the Potatoes: Bake for about 1 hour, stirring every 20 minutes, until the potatoes are fork-tender.
Serve: Toss the potatoes and serve, garnished with additional dill if desired.