01 - In a small bowl, whisk together 2 tbsp olive oil, lemon juice, minced garlic, dried oregano, a generous pinch of salt, and several grinds of black pepper until well combined.
02 - Place the chicken breasts in a shallow dish or a resealable plastic bag. Pour the marinade over the chicken, turning each piece to coat evenly. Let rest at room temperature for at least 15 minutes, or refrigerate up to 2 hours for more pronounced flavor.
03 - Heat an outdoor grill or grill pan to medium-high (about 400°F). Lightly oil the grates to prevent sticking.
04 - Drizzle the trimmed asparagus with a light coating of olive oil and season with salt and pepper. Toss gently to distribute evenly.
05 - Place the chicken breasts on the hot grill and cook for 5 to 6 minutes per side until golden grill marks form and the internal temperature reaches 165°F. Transfer to a plate and let rest for 5 minutes before slicing.
06 - Arrange the asparagus spears across the grill grates perpendicular to the bars. Cook for 2 to 3 minutes, turning occasionally, until lightly charred and crisp-tender. Remove and set aside.
07 - While the chicken rests, combine the Calabrian chili paste, 2 tbsp olive oil, white wine vinegar, honey, minced shallot, chopped parsley, and lemon zest in a small bowl. Stir thoroughly and adjust salt to taste.
08 - Slice the rested chicken breasts on a diagonal. Arrange over the grilled asparagus and drizzle generously with the Calabrian chili sauce. Serve immediately.