Hungarian Yellow Sweet Pepper Seeds (Banana Type) Heirloom Vegetable. Hungarian Sweet Banana produces, not surprisingly, banana shaped fruits between 15-20 cm (6-8″) long with a delightful bright waxy-yellow colour that typically changes to bright scarlet red as they mature. These stocky plants 50-60 cm (20-24″) tall produce a heavy yield of fruit. Depending on growing conditions, this pepper may mature to a brilliant sunshine yellow or a more subtle lemon yellow.