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 many who ate a light style of plum cake with tea, into which he would dip the cake, which he described as bun-like with currants "dotted here and there". Elizabeth David wrote that "Christmas mincemeat and Christmas plum pudding and cake are all such typical examples of the English fondness for spiced fruit mixtures that it seems almost unnecessary to include recipes for them ..." Plum cakes were raised by whipping air into the cake batter, rather than by the use of yeast. A range of plum cakes and puddings were published in the popular Book of Household Management (published