Corn on the Cob & Lime-Scallion Butter Lime-scallion butter (For 2 cobs)25g butter (softened) 1/2 lime (just zest)2 scallions, chopped fine salt & pepper Beat the butter with zest, onions & seasoning. You can blend this for ease but I like keeping the chopped scallions in tact. Sous Vide Corn Smear the butter on your cobs and sous vide at 82°C/179.6°F for 1 hour. Serve immediately or keep in the fridge for up to 3 days and either stick on the bbq or reheat in your sous vide.