Pour the lukewarm water into the Thermomix bowl, and then add the yeast, flour, olive oil, and salt.
Mix for 6 sec/speed 6, then knead for 2 min/dough setting.
Turn the dough onto a lightly floured surface and knead it into a ball. Place the ball in a large greased bowl, cover the bowl with a tea towel, and leave to rise in a warm place for approximately 1 hour until doubled in size.
Preheat the oven to 200°C/400°F (180°C fan) and line a baking tray with baking paper.
Once the dough has risen, knock it back and roll it into a rectangle approximately 5mm thick.
Sprinkle over the spinach, feta and sundried tomatoes. Starting at the long end, roll up into a sausage shape.
Cut into 8 equal portions and place cut side up onto the baking tray, leaving a small gap between each one. Brush with olive oil, then bake in the oven for 20-25 minutes until nice and golden. To check if they're cooked properly, they will sound hollow when tapped.
Let them cool on a wire rack before consuming them.
Notes
Storage: Let them cool completely before storing them in an airtight container at room temperature for a couple of days or in the freezer for three months.