Roasted Asparagus with Lemon, Butter, and Parmesan

Bahan-bahan (8 porsi)

• 2 lbs asparagus (or about 2 bunches)
• 1 lemon ((half juiced and half sliced into rings))
• 4 Tbsp unsalted butter (cut into pats)
• 1 Tbsp olive oil
• 1 tsp sea salt (or added to taste)
• 1/2 tsp black pepper, freshly ground, (or added to taste)
• 1/2 cup shredded parmesan cheese (or to taste)