Strawberry Jam
A bright, naturally sweet strawberry jam made from frozen berries, sugar, and lemon juice. This small‑batch jam sets beautifully without added pectin and delivers a fresh, fruity flavor perfect for toast, yogurt, pastries, or gifting.
Cook's notes
Frozen strawberries work perfectly — they break down quickly and produce consistent results year‑round. Thawing is optional. Thaw and drain if you want a thicker jam; cook from frozen if you prefer a looser, saucier texture. This small‑batch method works well with many berries, but each fruit behaves a little differently. Strawberries, blueberries, and raspberries break down easily and contain enough natural pectin to thicken with sugar and lemon juice. Blackberries and mixed berries also work, though they may need a slightly longer simmer to reach the same set. Very low‑pectin fruits (like cherries or blackberries with lots of seeds) may produce a softer jam unless cooked longer. Lemon juice provides natural pectin, helping the jam set without additives. Sugar affects thickness: more sugar = firmer set; less sugar = softer jam. Jam thickens as it cools, so remove from heat when it’s slightly looser than your ideal texture. Adjust sugar and cooking time as needed based on the fruit’s sweetness and juiciness. For best safety and longer shelf life, it’s strongly recommended to sanitize jars before filling them with hot jam: Instant Pot: Add 1–2 cups water, place jars on a trivet, run Steam or Sterilize for 30 minutes, air‑dry. Stovetop: Submerge jars in boiling water for 10 minutes, then air‑dry. Lids: Simmer gently in hot water (not boiling) to avoid warping.
Ingredients
- 1 lb (454g) strawberries(use whole or sliced)
- 0.75 cup (150g) sugar(standard granulated sugar works best; increase by 1-2 tbsp for a firmer set.)
- 1.5 tbsp (22ml) lemon juice(fresh lemon juice gives the best flavor and natural pectin boost; add another dash for extra brightness.)
Instructions
- 1
Place a small plate in the freezer to chill while you prepare the strawberries.
Tip: A cold plate is essential for testing the jam’s set later.
- 2
If you choose to thaw the frozen strawberries, microwave them for 1–2 minutes until just softened, or thaw in the fridge overnight. Drain off some liquid if you prefer a thicker jam.
- 3
Combine the strawberries and sugar in a bowl and let them sit for 30 minutes to draw out juices. If using fresh strawberries, they release liquid more quickly — 10–15 minutes of maceration is usually enough.
- 4
Transfer berries + sugar to a saucepan. Heat over medium, stirring until the sugar dissolves. Bring to a gentle boil.
- 5
Stir in the lemon juice once the mixture is boiling.
Tip: Lemon juice boosts natural pectin and brightens flavor.
- 6
Reduce heat to medium‑low. Simmer 15–20 minutes, mashing berries to your preferred texture. Stir frequently to prevent sticking.
Tip: The jam will foam slightly — this is normal.
- 7
Spoon a small amount of jam onto the cold plate and let it sit for a few seconds. Push the edge of the jam with your fingertip; if it wrinkles and holds its shape, the jam is ready. If it remains runny, continue simmering for a few more minutes before testing again. Remember that the jam will thicken further as it cools, so aim for a texture that is slightly looser than your final preference.
- 8
Pour the finished jam into a clean, sanitized jar. Let it cool to room temperature before refrigerating.
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