Wash and clean the spinach thoroughly. Peel and wash the carrots and cut them lengthwise into quarters. Wash the meat, dab dry and season with salt and pepper. Spread 1 tbsp. pesto and carrots on each roulade.
Roll up roulades and pin them with roulade needles. Heat the oil and fry the roulades for 10-15 minutes while turning. Peel onion and cut into fine cubes. Heat 1 tbsp. fat, fry onion until translucent, add spinach and fry for approx. 5 minutes.
Season to taste with salt, pepper and nutmeg. Melt 1 tablespoon of fat in a saucepan. Stir in flour and sweat briefly. Add stock and milk while stirring. Bring to the boil, boil for 3-5 minutes and season with salt and pepper.
Arrange on plates.