Corn off the cob – poco-cocoa

Ingredients

• 8 ears corn, husked and silked
• 6 cups vegetable broth
• 2 tablespoons butter
• 1 leek, white and tender green parts, thinly sliced
• 1 garlic clove, minced
• 1 large sweet potato, peeled and diced
• Salt
• 1 1/2 cups half-and-half
• 1 tablespoon sugar, or to taste
• Freshly ground black pepper