Wash the potatoes well and cut them lengthwise into wedges.: The first sensory cue is the feel of the rustic skins as you scrub them, removing any grit until the surface feels smooth beneath your hands. As you slice into wedges, you should see a firm, creamy interior with a clean cut that holds shape. This matters because even, sized wedges cook at similar rates, preventing some from burning while others stay raw. A common mistake is cutting uneven pieces which leads to inconsistent cooking, so aim for uniform thickness and size for consistent results.
Place the wedges in a bowl and toss with olive oil, garlic powder, onion powder, smoked paprika, salt, and black pepper until evenly coated.: When you toss, notice how the olive oil transforms the surface into a slightly glossy canvas, helping powders adhere. The aroma of the spices will emerge faintly, and the wedges should feel slick but not dripping. This even coating promotes uniform browning and ensures flavor on every bite. People often under-season or fail to toss thoroughly, resulting in clumps of spice; take time to mix so every wedge is equally seasoned.
Preheat the grill to about 400°F. Oil the grill grates lightly and place the potato wedges on them. Grill for about 5-7 minutes on each side or until tender and grill-marked.: As the grill heats, you will hear the faint hum of burners or charcoal settling into a steady heat, and the grates will radiate warmth when you hover your hand an inch above them briefly and carefully. Reaching approximately 400°F is important because that high heat creates a quick sear and sharp grill marks while cooking the interior gently. If the grill is cooler, the wedges will take longer and can dry out before developing color, so resist placing them on too-weak a fire.
Remove from the grill and, if desired, serve with lemon wedges and a sprinkle of chopped parsley or green onions.: When you oil the grates, a thin shimmer of olive oil reduces sticking and helps create clean grill marks, and the initial sizzle upon contact is the audible cue that the surface is hot enough. Arrange wedges spaced slightly apart so air circulates and steam does not accumulate, which prevents soggy results. A frequent error is crowding the grill, which lowers the surface temperature and prevents crisp edges, so leave some breathing room between pieces.
Grill for about 5 to 7 minutes on each side or until tender and grill-marked: The sensory progression here is key, you will hear a steady sizzle that softens as moisture releases, and the smell will shift toward a toasty, almost sweet aroma. Visually, the exterior should develop deep golden brown char lines, and when probed with a fork the wedge should yield easily without collapsing. This timing creates a crisp exterior while preserving a creamy center. Avoid flipping too frequently, which interrupts searing and reduces crisping; let each side form color before turning.
Remove from the grill and, if desired, serve with lemon wedges and a sprinkle of chopped parsley or green onions: As you lift the wedges off the grates there is a satisfying release of steam and a warm, earthy scent. A quick squeeze of lemon wedges adds bright acidity that cuts the oiliness, and a scattering of chopped parsley or green onions contributes fresh color and a pop of herbal flavor. This final step balances the dish and elevates the overall impression. One pitfall is letting the wedges sit too long before serving, which can soften the exterior, so plate them promptly for the best texture.