1. Rinse the Quinoa: Rinse 50 g of quinoa thoroughly under cold water to remove any saponins, which can cause bitterness.
2. Cook the Quinoa: In a small saucepan, combine the rinsed quinoa with 200 ml of water. Bring to a boil over medium-high heat.
3. Simmer the Quinoa: Once boiling, reduce the heat to low, cover the saucepan, and let it simmer for about 15 minutes until the quinoa is fully cooked and the water is absorbed.
4. Cool the Quinoa: Remove the saucepan from heat and let the quinoa cool down to room temperature.
5. Prepare the Blackberries: While the quinoa is cooling, gently rinse 100 g of blackberries under cold water. Ensure the berries are clean and fresh.
6. Blend the Ingredients: Once the quinoa is cooled, combine it with the rinsed blackberries in a blender or food processor. Blend until you achieve a smooth purée. If needed, you can add a little extra water to reach the desired consistency.
7. Serve: Spoon the purée into a baby-safe bowl, making sure it has cooled to an appropriate temperature before feeding your baby.

Summary:
This Quinoa and Blackberry Baby Purée is an excellent nutritious snack for babies aged 4-10 months. Quinoa provides a good source of protein and essential amino acids, while blackberries are rich in vitamins, antioxidants, and fiber, supporting healthy development.

Storing Options:
You can refrigerate any leftover purée in an airtight container for up to 3 days or freeze it in ice cube trays for up to 1 month.

Possible Side Effects/Allergies:
It is important to monitor your baby for any potential allergic reactions when introducing new foods, such as quinoa or blackberries. Look for signs of digestive discomfort, skin rashes, or unusual behavior, and consult your pediatrician if you have any concerns.