Remove the steak from the fridge 20–30 minutes before grilling.
In a small bowl, whisk together the harissa paste, hot honey, olive oil, lemon juice, garlic, salt, and pepper.
Place the steak directly on your cutting board and rub the marinade all over. Let sit while the grill heats.
Preheat the grill to medium-high heat. (No grill? You can also cook the steak, peaches, and corn in a hot cast iron skillet using the same timing and method.) Drizzle the peaches and corn with olive oil.
Place the peaches cut-side down on the grill and cook for 3–4 minutes until caramelized and softened. Remove and set aside.
Grill the corn, turning occasionally, for 8–10 minutes until lightly charred all over. Remove and let cool slightly.
Grill the steak for 4–5 minutes per side, or until desired doneness. Transfer directly back onto the board and let rest for 5–10 minutes.
Slice the steak against the grain directly on the board, letting the juices collect. Give it a rough chop.
Slice the peaches and cut the corn kernels off the cob. Start building your salad in a large bowl with the steak, peaches and corn.
Add the arugula, herbs, and feta over the top. Squeeze fresh lemon over everything and drizzle with a little olive oil and (optional) hot honey.
Using tongs or your hands, gently fold everything together—just enough to combine without overmixing.
Finish with flaky salt, if desired, and serve. Enjoy!