Place the peas in a saucepan of boiling water over high heat. Boil for 2-3 minutes, drain and immediately plunge in a bowl of iced water. Drain. Return the saucepan to medium-low heat and add the sugar, butter and peas. Cook, stirring, until the butter melts and coats the peas, about 1 minute. Season with sea salt, freshly ground black pepper, and mint. Transfer the peas to a serving bowl, season with chives and juice of one lime if using. Serve immediately.