- Combine the berries, dates, and sea salt in a saucepan over medium-low heat. Allow the mixture to heat up so the fruit breaks down and begins to bubble, then reduce heat to low, cover, and let simmer until the fruits break down further, about 10 minutes.
- Add the chia and lemon zest, and let cook for another 3–5 minutes until the chia helps the jam thicken. Taste, and add extra sweetener if desired.
- Let cool, then refrigerate.
Measuring 3 cups of berries can produce quite variable amounts—for instance, if measuring whole strawberries, just a few can fill up 1 cup. So, for larger berries like strawberries, simply slice them a few times or roughly chop before measuring. A standard 1-pound clamshell container of strawberries is 3–3½ cups chopped strawberries.
The dates will darken the mixture slightly if using strawberries or raspberries instead of blueberries. Still, they don’t darken it much, and also help thicken the jam. Give them a try: it’s a different twist on jam, but it’s delicious!
I don’t normally add extra sweetener, as I find the dates usually lend enough sweetness. However, depending on the type of berries used, and their ripeness, you may desire a touch of extra sweetener. Options include a few tablespoons of coconut sugar, a drizzle of pure maple syrup, or a few pinches of stevia.