0-100 SHU. The pimento pepper is a sweet, mild variety of Capsicum annuum. Recognizable by its heart-shaped, vibrant red fruits, the pimento pepper typically measures 3-4 inches long and 2-3 inches wide. Its thick, juicy flesh is exceptionally sweet and aromatic, making it perfect for a variety of culinary uses, including fresh eating, stuffing, roasting, and canning.