01 -
Place day-old bread pieces into a food processor and pulse until fine. Measure out 1.5 to 2 cups (approximately 100–120 g) of breadcrumbs.
02 -
Warm 2 tablespoons of extra-virgin olive oil in a nonstick skillet over medium heat. Add the breadcrumbs and 1/4 teaspoon kosher salt. Toast, stirring occasionally, until the crumbs are golden brown, 5–15 minutes. Adjust heat as needed to prevent burning. Remove from heat and let cool briefly, tasting for seasoning. Measure out 1/3 cup (around 25–30 g) toasted crumbs for the salad; reserve any extra for garnish or another use.
03 -
Place walnuts into a dry medium skillet over low heat. Stir occasionally while toasting, until fragrant and golden, about 5–8 minutes. Remove from heat and roughly chop.
04 -
Using a sharp knife, cut asparagus spears thinly on the bias into slivers.
05 -
In a large mixing bowl, combine toasted walnuts, 1/3 cup toasted breadcrumbs, grated Parmigiano Reggiano, crushed red pepper flakes, salt, black pepper, lemon zest, and lemon juice. Stir well to combine.
06 -
Add sliced asparagus to the bowl and toss thoroughly to coat with the dressing and aromatics. Taste and adjust with additional salt, pepper, red pepper flakes, or lemon juice as desired.
07 -
Fold in mint leaves, if using, and 60 ml olive oil. Give the salad a final gentle toss. Taste and adjust seasoning. Transfer to a serving platter and finish with additional black pepper if desired.