Toast the ⅓ cup pine nuts toasted in a dry Skillet over medium-low heat, stirring frequently, until golden and fragrant, about 3–4 minutes. Watch them carefully — they go from golden to burnt quickly. Transfer immediately to a plate to cool.

Add the 2 cups fresh basil leaves packed, stems removed, 3 cloves garlic peeled, toasted ⅓ cup pine nuts toasted, and ½ tsp kosher salt plus more to a Food Processor. Pulse 8–10 times until coarsely chopped, scraping down the sides as needed.

Add the ¾ cup Parmesan cheese freshly grated and 1 tsp lemon juice freshly squeezed (if using). With the processor running, slowly drizzle in the ½ cup extra-virgin olive oil good quality through the feed tube. Blend until smooth but still slightly textured — about 30 seconds. Taste and adjust ½ tsp kosher salt plus more and ¼ tsp black pepper freshly ground. Set aside.

Peel and slice onions to about 1/8-inch thick — thin enough to cook quickly, thick enough to avoid scorching. Yellow or Spanish onions work best. Limit to 2 large onions per 12-inch Skillet to prevent steaming. Have your fat ready and keep a splash of water, broth, or wine nearby to deglaze if needed.

Heat a Skillet over medium to medium-high heat. Add butter, oil, or a mix and let it shimmer. Add sliced onions in large handfuls, stirring for 1–2 minutes per batch until they begin to soften — this prevents overcrowding. Once all onions are in, season with a pinch of salt. Cook over medium heat, stirring every few minutes, for 8–12 minutes total until soft, translucent, and lightly golden. To speed up softening, add 1/4 to ½ cup water or broth and cover; steam wilts the onions in a few minutes. Remove the lid once liquid evaporates and continue cooking uncovered. If the pan looks dry, deglaze with a splash of water, broth, or wine, scraping up any browned bits. Don't crank the heat — high heat burns the outside before the onions cook through.

Drain the 1 lb spaghetti or linguine, trofie, or casarecce in a Colander. Do NOT rinse it — the surface starch helps the sauce adhere.

Taste and adjust seasoning with ½ tsp kosher salt plus more and ¼ tsp black pepper freshly ground as needed.

Divide the 1 lb spaghetti or linguine, trofie, or casarecce among warm bowls. Top with extra ¾ cup Parmesan cheese freshly grated, a few toasted ⅓ cup pine nuts toasted, and a couple of fresh 2 cups fresh basil leaves packed, stems removed. Serve immediately.

Peel and slice onions to about 1/8-inch thick — thin enough to cook quickly, thick enough to avoid scorching. Yellow or Spanish onions work best. Limit to 2 large onions per 12-inch Skillet to prevent steaming. Have your fat ready and keep a splash of water, broth, or wine nearby to deglaze if needed. Heat a skillet over medium to medium-high heat. Add butter, oil, or a mix and let it shimmer. Add sliced onions in large handfuls, stirring for 1–2 minutes per batch until they begin to soften — this prevents overcrowding. Once all onions are in, season with a pinch of salt. Cook over medium heat, stirring every few minutes, for 8–12 minutes total until soft, translucent, and lightly golden. To speed up softening, add 1/4 to ½ cup water or broth and cover; steam wilts the onions in a few minutes. Remove the lid once liquid evaporates and continue cooking uncovered. If the pan looks dry, deglaze with a splash of water, broth, or wine, scraping up any browned bits. Don't crank the heat — high heat burns the outside before the onions cook through.