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Strawberry and Pineapple Jam
One pineapple, two quarts of strawberries, three cups of sugar. Cook until thick.
— Mrs. Leonard Warren
Three lines and no method to speak of, which is typical of a village contributor writing for cooks who already knew what jam looked like in the pan. The proportions are worth reading closely: this is a low-sugar preserve by period standards, and that governs everything about how it should be handled.
- What the quantities come toTwo quarts of strawberries is roughly 2 1/2 to 3 lb hulled; one pineapple gives about 3 to 4 cups of trimmed, cored flesh. Three cups of sugar is about 1 1/4 lb, well under half the weight of the fruit.
- Prepare the pineapple firstThe recipe assumes you know to peel, core and chop or crush it. Pineapple is much firmer than strawberry and needs a head start of five to ten minutes in the pan before the berries go in, or the fruit finishes at two different textures.
- "Cook until thick" in practiceWith this little sugar the jam sets by evaporation rather than by a strong pectin-and-sugar gel. Expect 30 to 45 minutes at a steady boil in a wide pan, stirring often near the end. A cold saucer chilled in the freezer is the reliable test: a spoonful should wrinkle when pushed.
- Pectin and fresh pineappleBoth fruits are low in pectin, and fresh pineapple carries bromelain, a protein-digesting enzyme. Boiling destroys it, and in any case bromelain acts on proteins rather than on pectin, so the set of the jam is unaffected.
- ScorchingLow-sugar fruit purees catch easily once they thicken. Use the widest heavy-bottomed pan you have and drop the heat in the last ten minutes.
- StorageThe book gives no sealing or processing instructions, and at this sugar level the jam is not shelf-stable. Treat it as a refrigerator preserve, good three to four weeks, or freeze it. For a pantry jam, follow a current tested water-bath canning recipe.
- YieldRoughly four to six half-pint jars, depending on how far you reduce it.
Church and village receipt books often printed contributions much as they were handed in, which may be why the method stops at three words: Mrs. Warren was presumably writing for neighbors who had made jam before. The pairing is the interesting part. Strawberries were local and seasonal, while pineapple arrived canned or as whole fruit shipped north, a luxury that was becoming more affordable in American markets around the turn of the twentieth century as steamship trade with the Caribbean and Hawaii expanded. Combining the two stretched an expensive novelty across a cheap glut, and the pineapple's acidity and firm flesh gave body to strawberries that on their own tend to cook down to syrup. The modest sugar suggests a jam meant to be eaten within the season rather than laid away for winter.