Prepare the cake: Center a rack in the oven and preheat the oven to 350 degrees F. Butter a 8-inch cast-iron skillet, other heavy oven-proof skillet, a 8-inch cake round cake pan, or a 9-inch pie dish. (If using pie dish, check baking time a few minutes ahead.)
Prepare the strawberries: Place a rack in the center of the oven and preheat oven to 375 degrees F. Line a rimmed baking sheet with parchment paper or foil. (Be sure to use a rimmed baking sheet to catch any strawberry juices.) In a medium bowl, whisk together honey, olive oil, and salt until well combined. Add strawberries to bowl, then gently toss to coat. Arrange strawberries in a single layer on the prepared baking sheet. Roast for 20-25 minutes, watching carefully towards the end—the juices will thicken and darken, but should not scorch. Gently scrape the berries and juice into a small bowl while still warm. Set aside.