Michigan Blueberry Preserves

Whole-berry blueberry preserves set with natural pectin, from the commercial highbush fields of southwestern Michigan

Origin: Southwestern Michigan, United States

From the journey of Blueberry.

Michigan is the largest producer of cultivated highbush blueberries in the United States, and the state's blueberry preserves tradition is inseparable from the summer harvest calendar of its fruit-belt counties. Van Buren and Berrien counties in southwestern Michigan, sitting on the sandy glacial soils along the eastern shore of Lake Michigan, have grown blueberries commercially since the 1930s and produce an annual harvest of extraordinary scale. The domestic preservation of blueberries through jam-making predates commercial cultivation: New England and Great Lakes households put up blueberry preserves as a standard practice of the summer harvest, alongside apple and raspberry, as insurance against the winter. Michigan blueberry preserves are characterised by a preference for whole berries or large pieces suspended in a lightly set, intensely flavoured jelly: the flavour of the berry should not be boiled away into an undifferentiated sweetness. The best Michigan preserves use lemon juice as the acidic catalyst for the natural pectin already present in blueberry skins, and are cooked as briefly as possible to preserve the aromatic complexity of the fresh fruit. This recipe follows the whole-berry style, capturing the bright, slightly tart character of the highbush blueberry in a preserve that keeps its identity on bread, pancakes, and yoghurt alike.

Ingredients

Fruit

900 g fresh blueberries, rinsed and any stems removed

Sugar

700 g granulated or preserving sugar

Acid

3 tbsp lemon juice, freshly squeezed (from about 2 lemons)
1 tsp finely grated lemon zest

Seasoning

0.5 tsp fine sea salt

Method

Sterilise three 300 ml jam jars and their lids by washing them in hot soapy water, then placing them in an oven at 120°C for 15 minutes. Keep warm until needed. Place two or three small saucers in the freezer for the set test.
Combine the blueberries, sugar, lemon juice, lemon zest, and salt in a large, wide, heavy-based saucepan or preserving pan. Stir to combine. Leave to macerate for 20 minutes: the sugar will begin to draw juice from the berries.
Place the pan over medium-high heat and bring to the boil, stirring to dissolve the sugar. Once boiling, cook at a vigorous rolling boil, stirring frequently and skimming any grey foam that rises. The jam will deepen in colour from bright to a dark, glossy blue-purple.
After 15 minutes of boiling, test for set: drop a small amount of jam onto a cold saucer from the freezer. Push it with your finger after 30 seconds. If the surface wrinkles and the jam does not run back together, it is set. If it runs freely, continue cooking for 3 to 5 minutes and test again.
Remove from heat. Ladle into the warm sterilised jars, filling to within 5 mm of the rim. Seal immediately with the lids. Leave undisturbed overnight to set completely.

The Gastrographer

Name: Michigan Blueberry Preserves
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Yield: 3
Cuisine: United States
Ingredients: 900 g fresh blueberries, rinsed and any stems removed; 700 g granulated or preserving sugar; 3 tbsp lemon juice, freshly squeezed (from about 2 lemons); 1 tsp finely grated lemon zest; 0.5 tsp fine sea salt

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Ingredient originTrade or transit route

Became a culinary stapleColonial / trade control