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English Rock
Put seven pounds of moist sugar and one quart of water into a sugar-boiler, boil it to the crack, turn it out onto an oiled slab, and spread over and work in thoroughly four pounds of sweet almonds, not blanched, form the mass into a roll, and let it get cool. Cut it into slices about one-half inch in thickness, and when perfectly cold it should be packed away in tins.
A Victorian almond hard candy, written at commercial scale for a hotel pantry. Almost everything here hinges on one number the original gives only as a word.
- "Boil to the crack"This is the hard-crack stage, about 300-310F on a candy thermometer. Much below that and the rock will be chewy and will weep in the tin; much above and it begins to caramelize and darken. Test the old way if you like — a drop in cold water should shatter, not bend.
- Moist sugarNineteenth-century "moist sugar" is unrefined or partly refined soft sugar, closest today to light brown or golden caster sugar. It carries a little molasses, which is why the finished rock is tan rather than glassy white. Plain granulated works and gives a cleaner, paler candy.
- Scale it downSeven pounds of sugar and four of almonds yields something like eleven pounds of candy. A quarter batch — 1 lb 12 oz sugar, 1 cup water, 1 lb almonds — fits a domestic pan and still fills two large tins.
- The sugar-boilerA deep, heavy, unlined copper or stainless pan, at least four times the volume of the syrup, since boiling sugar climbs. Do not use nonstick or a thin pan; scorched spots at 300F are irreversible.
- The oiled slabA marble slab is ideal because it pulls heat out fast. A large rimmed baking sheet lined with lightly oiled foil or a silicone mat is the practical substitute. Oil it before you start boiling — there is no time once the syrup is ready.
- Almonds, not blanchedSkins on, as written, and they are much easier to work in if warm and dry; cold nuts chill the syrup so that it stiffens before the nuts are evenly distributed. A short spell in a low oven to warm them through is enough — hold them warm until you need them.
- Slice while it is still warmSlice before it is fully cold -- The instruction to cut half-inch slices works only in a narrow window: firm enough to hold its shape, not yet hard. The recipe's own sequence says as much, cutting when the roll is "cool" and packing only when "perfectly cold". Leave it to go cold before cutting and it will shatter under the knife.
- StorageAirtight is the whole point of the tins. Hard-crack sugar is hygroscopic and goes tacky within hours in a humid kitchen; layer with parchment and keep it sealed and cool.
Rock in the English sense is not American rock candy — not sugar crystallized on a string — but a boiled hard sweet, the same family as the lettered seaside sticks sold at Blackpool and Brighton from the later nineteenth century onward. Almond rock, made by working whole nuts into hard-crack syrup and rolling it into a log to slice, was a standard line in British confectioners' shops. Oscar Tschirky's 1896 book gathers the working knowledge of the Waldorf's kitchens, and its candy chapter reads like the notes of a hotel confectioner rather than a home cook: quantities in the pounds, doneness given by stage rather than degree, and the assumption that a marble slab and a copper sugar-boiler are simply to hand. That the recipe is called "English" at all might suggest an import into an American hotel that was, in these years, often said to be trading on European polish.