Grilled-Corn Grits With Prawns and Lime Butter

Ingredients

• 3 corn cobs, soaked in cold water for 15 minutes, drained
• For brushing: olive oil
• 180 gm butter, coarsely chopped
• 175 gm grits (see note) (1 cup)
• 1½ tbsp smoked paprika
• 1 tbsp thyme, finely chopped
• 1 garlic clove, finely chopped
• 2 tsp ground cumin
• 1 tsp dried oregano
• 1 tsp whole black peppercorns, ground in a mortar and pestle
• 800 gm uncooked prawns (about 20), cleaned, tails intact
• Finely grated rind of 1 lime, juice of 2
• To serve: fresh oregano leaves