Preheat oven to 375° F.
In a 9x13-inch baking dish, toss together the sliced strawberries and sugar. Use a sharp knife to scrape the vanilla beans from the pod and add to the mixture along with the pod. Roast until juices are bubbling and berries are slumped, about 15-20 minutes. Remove from the oven and let cool to room temperature.
Blend the roasted strawberries (and all of their juices) and yogurt in a blender or food processor until smooth. Chill mixture completely in the fridge, about 2 hours.
Freeze in an ice cream machine according to manufacturer's instructions. Transfer to a bowl or plastic container and let harden in the freezer for 1-2 hours before serving.
Calories: 144kcal, Carbohydrates: 32g, Protein: 2g, Fat: 2g, Saturated Fat: 1g, Cholesterol: 6mg, Sodium: 22mg, Potassium: 158mg, Fiber: 1g, Sugar: 30g, Vitamin A: 52IU, Vitamin C: 34mg, Calcium: 65mg, Iron: 1mg