This is the step that separates a truly excellent grilled steak from a merely good one, and it costs nothing but time. Pat both sirloin steaks completely dry with paper towels. Season extremely generously with kosher salt on all surfaces — both flat sides and all edges. Be bold: you are not seasoning for flavor alone here, you are drawing moisture to the surface as part of a deliberate technique. Place the salted steaks on a wire rack set over a plate and slide them uncovered into the refrigerator for 2–4 hours. The salt first draws moisture to the surface through osmosis, then that moisture dissolves the salt and is reabsorbed back into the meat carrying the salt with it — this is the brining effect. Meanwhile, the exposed surface of the steak dries out in the refrigerator's cold, circulating air, forming a dry pellicle on the surface. A dry surface is what produces a proper sear on a grill — moisture is steam, and steam prevents the Maillard browning that creates the caramelised crust and char marks you are aiming for. When you are ready to cook, remove the steaks from the refrigerator, rinse under cold running water to remove all the surface salt, then pat completely dry again. Season freshly and generously with salt and black pepper on all sides immediately before grilling.

Do this immediately after putting the steaks in the refrigerator so they have maximum pickling time. Slice the red onions into thick rings — thick enough to retain some structure after pickling rather than collapsing into thin slivers. In a heatproof jar or bowl, combine the boiling water, vinegar, sugar, salt, coriander seeds, and black peppercorns, stirring until the sugar and salt are fully dissolved. Add the onion rings, pressing them down until completely submerged. Leave at room temperature — they will be ready within 30 minutes but improve continuously over the following hours, turning from sharp and raw to sweet, tangy, and vividly pink-purple. The coriander seeds infuse a warm, slightly citrusy note that connects the pickle to the chimichurri's herb character.

This is a half batch of the Classic Chimichurri Sauce — same technique, half the quantities. Rinse the parsley thoroughly under cold water, dry completely in a salad spinner or with a clean kitchen towel, then strip the leaves from the thicker lower stems. Finely chop the parsley with a sharp chef's knife using a rocking motion — coarse enough to keep the sauce textured and rustic, not so fine it becomes a paste. Crumble the bay leaves and finely mince or grate the garlic. Combine all chopped herbs, garlic, bay leaves, chili flakes, dried oregano, salt, and pepper in a bowl. Add the red wine vinegar and stir briefly, then pour the olive oil over and stir to combine. Taste and adjust salt. The chimichurri should be bold, garlicky, sharp from the vinegar, and generously herby. Set aside at room temperature — it improves as it sits and the garlic infuses the oil. Full technique detail is in the Classic Chimichurri Sauce recipe.

Light the grill and allow it to reach high heat — you need a grilling surface hot enough to sear steak and caramelise peach sugars rapidly on contact, which requires genuine heat rather than medium warmth. While the grill heats, slice the peaches into medium-thick wedges — thick enough to hold their shape through grilling without falling apart, thin enough to caramelise quickly. Place all the peach wedges in a bowl, drizzle with the 20ml of olive oil, and toss to coat every surface. The oil is not for flavor here — it is a barrier between the peach's surface and the grill grates that prevents the natural sugars from immediately burning and sticking. Do not season the peaches with salt or anything else — their role in this salad is one of sweet, caramelised contrast, and seasoning would interrupt that.

In a small bowl or jar, combine the white wine vinegar, Dijon mustard, honey, lemon juice, salt, and pepper. Whisk together until incorporated, then add the olive oil in a thin stream while whisking to form a light emulsion. This dressing is intentionally restrained — its job is to ensure the greens are not plain and dry, not to compete with the chimichurri that will drench the finished bowl. It should taste bright, clean, and barely-there rather than assertive. Set aside.

Grill the peach wedges first. Place on the hot grill grates and leave undisturbed until bold char marks form and the surface caramelises — approximately 2–3 minutes per side depending on grill heat. The goal is visible, dark grill marks, soft flesh, and the distinct smell of caramelising fruit sugar. The peaches should be fully soft and yielding when pressed gently at the tip — this is the point where their natural sugars have completely caramelised and their flavor has deepened from simply sweet to complex and almost jammy with a slight smokiness from the char. Remove and set aside. Now grill the steaks on the hottest part of the grill. Do not move them after placing — allow them to develop char marks and crust undisturbed for 3–4 minutes, then rotate 45 degrees for cross-hatch marks if desired, then flip once and repeat on the second side. Pull at 54–57°C internal temperature for medium-rare. Transfer to a cutting board and rest for a minimum of 8 minutes — do not skip this.

While the steak rests, build the salads. In a large bowl, toss the mixed greens with the vinaigrette — use enough to lightly coat every leaf. Divide the dressed greens among four wide, shallow bowls as the base. Scatter the halved cherry tomatoes, seasoned generously with salt and pepper, across the greens. Arrange the grilled peach wedges among the tomatoes — distribute them evenly so every portion has the same amount. Add the pickled red onion rings, draped naturally over the surface rather than piled. Slice the rested steak firmly against the grain into strips approximately 5–7mm thick, then fan the slices across the center of each bowl so the pink interior is visible. Finally — and generously — spoon chimichurri directly over the steak slices and allow it to run down into the salad below. Do not be conservative with the chimichurri: the heavy drizzle visible in the reference image is the defining visual element of the dish and the flavor delivery system that ties every component together.