Tomato stand-alone or multiple-bay greenhouses is on the increase, providing fruit during those times of the year when field-grown fruit is not readily available. Smaller sized fruit (cherry and grape), or cluster tomatoes (fruit-on-the-vine) are the fruit of choice for the large commercial greenhouse operators while the beefsteak varieties are the choice of owner-operator growers. Hydroponic technique is often used in hostile growing environments, as well as high-density plantings. To facilitate transportation and storage, tomatoes are often picked unripe (green) and ripened in storage with ethylene. Unripe tomatoes are firm. As they ripen they soften until reaching the ripe state where
Plum cake to World War I, cakes, including plum cakes, were baked along with loaves of bread. "A smaller cake or pasty might be slipped in or pulled out after the baking had begun, but a raised pie with well-protected sides, or a large plum cake, would take at least the same time as the loaves, and experienced housewives made them in sizes to do so." The English variety of plum cake also exists on the European mainland, although "plum cake" there more usually refers to baked cakes made with fresh, rather than dried fruit. In French cooking, plums are an ingredients