To prepare the jam, add the berries to a small pan along with the water and 1 teaspoon of erythritol.
Bring the mixture to a rapid boil and break the fruit down a little with the back of a fork. Reduce to a simmer for a minute or two until you have a thickened and reduced jam. Set aside.
Add the ground almonds, remaining erythritol, cinnamon and baking soda to a food processor. Pulse to combine.
Add the eggs and blend well to combine.
Melt the coconut oil and add to the food processor along with the almond milk, syrup, vanilla and lemon juice. Blend to form a smooth batter.
Preheat the oven to 350 degrees Fahrenheit and line a 12 cup muffin tray with muffin cases.
Spoon a heaped teaspoon of batter into each case, creating a thick layer at the bottom.
Divide the jam evenly between cases, in the center of the batter.
Divide the remaining batter between the 12 cups, covering the jam completely.
Transfer to the oven to bake for 18-20 minutes until golden brown.