This weeknight steak dinner is a full-flavored embrace of the summer. Roasted eggplant and red onions are tossed with balsamic and basil, and a nice spicy kick of chili. Jarred sun-dried tomatoes are turned into a quick pesto to round out the dish.
Put a rimmed baking sheet in the oven and preheat to 450˚ F. Combine the eggplant, red onion, 1/4 cup olive oil, 3/4 teaspoon salt and the red pepper flakes in a large bowl and toss to coat. Spread out on the preheated pan and roast, tossing once, until browned around the edges and tender, 20 to 25 minutes. Remove from the oven and drizzle with the balsamic vinegar; toss gently.
Meanwhile, combine the sun-dried tomatoes, garlic, lemon juice, 2 tablespoons water and a pinch of salt in a food processor or mini chopper. Pulse until mostly smooth (it should be the consistency of a thick pesto; if it’s too thick, add more water 1 teaspoon at a time). Adjust the seasoning, if needed.
Season the steak all over with salt, pepper and the herbes de Provence. Heat a large skillet over medium-high heat; add the remaining 1 tablespoon olive oil and heat until shimmering. Add the steak and cook until well browned, about 4 minutes. Flip and cook until browned on the other side, 4 to 5 minutes for medium rare. Transfer to a cutting board to rest 5 minutes.
Toss the basil with the eggplant; season with salt, if needed. Divide among plates. Slice the steak, divide among the plates and top with the sun-dried tomato mixture.