01 - In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, 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 piece to coat evenly. Allow to marinate for at least 15 minutes at room temperature, or refrigerate for up to 2 hours for more pronounced flavor.
03 - Preheat an outdoor grill or a grill pan to medium-high heat, approximately 400°F. Lightly oil the grates to prevent sticking.
04 - Toss the trimmed asparagus with a drizzle of olive oil, a pinch of salt, and a few grinds of black pepper. Set aside.
05 - Remove the chicken from the marinade, letting any excess drip off. Place the breasts on the hot grill and cook for 5 to 6 minutes per side, until golden grill marks appear and the internal temperature reaches 165°F. Transfer to a plate and let rest for 5 minutes before slicing.
06 - While the chicken rests, place the asparagus on the grill. Cook for 2 to 3 minutes, turning occasionally, until the spears are lightly charred and tender-crisp. Remove from the grill and set aside.
07 - In a small mixing bowl, combine the Calabrian chili paste, olive oil, white wine vinegar, honey, minced shallot, chopped parsley, and lemon zest. Stir until smooth and season with salt to taste. Adjust the heat level by adding more chili paste if desired.
08 - Arrange the grilled chicken breasts and charred asparagus on serving plates. Drizzle generously with the Calabrian chili sauce and serve immediately.