Add the blackberries, vinegar, lemon juice, erythritol, salt, mustard, and black pepper to a small saucepan. Place it over low heat. Use a small whisk to mash the blackberries and whisk all the ingredients together.
Step 2
Remove the saucepan from the heat when the mixture is warm and the erythritol has dissolved. Gradually drizzle the olive oil with one hand while blending using a hand blender with the other hand.
Step 3
Once the vinaigrette is emulsified, taste and adjust the seasoning to your liking. Pour it into a jar and keep it in the fridge for up to a week. Drizzle on your salad, roasted veggies, or cooked proteins.