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Maple Mousse (Put one pint of maple syrup)
Put one pint of maple syrup into a saucepan with the yolks of eight eggs. Stir over the fire until syrup thickens; then remove at once and stir until it is cold. Fold into it one quart of whipped cream and pack in a mold in ice and salt for five hours.
This is a still-frozen mousse: a cooked maple custard lightened with whipped cream and hardened without churning. Everything depends on not scrambling the yolks.
- The hinge: cook gently, stop earlyEight yolks in a pint of syrup will curdle if the pan gets too hot; the heavy sugar load raises the coagulation point somewhat above the 180F usual for a plain custard, but the margin is still narrow. Use low heat or a bowl over simmering water, stir constantly, and pull it the moment it coats the spoon — "remove at once" is the operative instruction. Straining it into a cold bowl at that point is cheap insurance.
- Stir until coldThe original means cool it fully before the cream goes in, and stirring keeps a skin from forming and speeds the drop. A bowl set in ice water takes it down in ten to fifteen minutes.
- "One quart of whipped cream"Genuinely ambiguous: it may mean a quart of cream, whipped, or a quart of volume after whipping (about a pint of heavy cream). A pint of heavy cream, whipped to soft peaks, gives a mousse that still tastes of maple; a full quart of cream whipped yields roughly two quarts of foam and a milder, lighter result. Whip only to soft peaks either way, or the mixture stiffens before you can fold it.
- Maple syrupA pint is 16 fl oz, about 2 cups. Period syrup was likely darker and stronger in flavour than the lightest grades sold today; a dark syrup (the grade formerly sold as B) gets closer to the intended flavor. No sugar is added anywhere, so the syrup carries the whole sweetening job.
- Ice and saltThe mold was buried in a bucket of crushed ice mixed with rock salt, roughly three or four parts ice to one of salt, which brings the bath well below freezing. A modern freezer does the same work: cover the mold and give it five to six hours, or overnight.
- The moldUse a metal loaf pan or a lidded metal mold; metal chills through faster than glass or ceramic. If you are packing in ice, seal the seam with butter or a strip of cloth so brine cannot seep in — salt water in the mousse is the classic failure of this method.
- Unmolding and yieldDip the mold briefly in warm water and invert. Expect about eight to ten servings from the smaller version, more if you use a full quart of cream. Serve immediately; without churning or stabilizers it softens quickly.
"Mousse" is simply French for foam, and in late nineteenth-century American cookery it named a frozen dessert built on whipped cream rather than a churned custard — a still-frozen sweet that needed a mold and a bucket of ice but no freezer crank. That distinction mattered in a period when commercial ice was cheap and widely delivered but hand-cranked freezing was labor. Maple syrup as the sole sweetener points to New England and eastern Canada, where sugaring was a spring household industry and syrup was on hand in quantity. The technique is essentially a cooked yolk-and-syrup custard folded with cream, and it survives in Quebec as mousse à l'érable.