Grilled Polenta with Shrimp & Escarole

Preheat grill to high. Place 1 tablespoon oil and garlic in a large saucepan over medium heat. Cook, stirring, until the garlic is sizzling and fragrant, 1 to 2 minutes. Add crushed red pepper; cook, stirring, until fragrant, about 30 seconds. Add tomatoes and oregano; bring to a boil. Reduce to a simmer and cook until juicy, about 3 minutes. Stir in shrimp and escarole; cook, stirring, until the escarole is wilted, about 2 minutes. Remove from the heat, cover and keep warm. Oil the grill rack (see Tip). Grill polenta slices until hot and slightly charred, 3 to 4 minutes per side. Divide the sauce among 4 shallow bowls or plates. Top with the polenta slices, sprinkle with olives (if using) and drizzle each serving with 1/2 teaspoon oil. Serve immediately.