In a small bowl prepare the flavoured butter by mixing together the softened butter, harissa, chopped coriander and smoked Maldon salt.
Heat up the BBQ or alternatively you can use a griddle pan. Use a pastry brush to cover the corn with the butter and then place them onto the BBQ and cook for 4 – 5 minutes on each side until the corn is bright yellow and cooked, with charred areas.
Once the corn is cooked, brush with a little extra of the butter and a final sprinkling of Maldon smoked salt – serve straight away.