Citrus Roasted Asparagus

Bahan-bahan (4 porsi)

• 2 medium mandarin oranges, (divided)
• 2 medium lemons, (divided)
• 1 tablespoon extra virgin olive oil
• 1 teaspoon minced garlic
• 1 teaspoon dried tarragon or thyme
• 1 pound asparagus spears, (trimmed (see tips below))
• kosher salt and freshly ground black pepper, (to taste)