01 - In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, and a generous pinch each of salt and 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 breast to ensure even coating. Let marinate at room temperature for at least 15 minutes, or refrigerate for up to 2 hours for more pronounced flavor.
03 - Heat an outdoor grill or grill pan to medium-high, approximately 400°F. Lightly oil the grates to prevent sticking.
04 - Toss the trimmed asparagus spears with a drizzle of olive oil, salt, and pepper in a bowl or directly on a sheet of foil, ensuring each spear is lightly and evenly coated.
05 - Place the marinated chicken breasts onto the hot grill. Cook for 5 to 6 minutes per side until the exterior is golden with distinct grill marks and the internal temperature reaches 165°F. Transfer to a plate and let rest for 5 minutes before serving.
06 - Arrange the asparagus across the grill grates perpendicular to the bars. Grill for 2 to 3 minutes, turning occasionally with tongs, until lightly charred and crisp-tender. Remove and set aside.
07 - While the chicken rests, combine the Calabrian chili paste, olive oil, white wine vinegar, honey, minced shallot, chopped parsley, and lemon zest in a small bowl. Stir thoroughly and season with salt to taste. Adjust the heat level with a pinch of red pepper flakes if desired.
08 - Arrange the rested chicken breasts and grilled asparagus on serving plates. Drizzle the Calabrian chili sauce generously over the top and serve immediately.