Fish w/Golden Sauce

Ingredients

• 2 small lemons, peeled and cut into thin rounds
• 1 tbsp. ground turmeric
• Kosher salt, to taste
• 1 tbsp. olive oil (divided) plus more for drizzling
• 4 cloves garlic, minced
• 1/2 tsp. saffron threads, crushed and steeped in 1/4 cup warm water
• 1 bunch fresh cilantro, stemmed and chopped (divided)
• 4 6-oz. fish steaks or fillets such as swordfish, halibut, sea bass, or cod
• Freshly ground black pepper, to taste
• 1 cup (1/4 pound pitted green olives
• Ground cumin