Chop the spring onions, mix w/ the Herbs of Provence & the sweet mustard. Add some salt & pepper to taste.
Place the beef roulades on a plate or board large enough.
Add the Dijon mustard & distribute evenly all over the roulades.
Add the bacon & the dried tomatoes.
Finally add the spring onion mess.
Roll up the roulades & fix w/ pins or butcher's string.
Put the roulades in a frying pan w/ some olive oil & start frying. Turn the roulades from time to time. This shall take about 15 min max. until the roulades are nicely brown.
In the meantime: clean, trim & chop the carrots, the onion & the celeriac.
Put the roulades on a plate & continue w/ frying the vegetables in olive oil for about 10-15 min.
Add the bay leaves, the roughly chopped cloves of garlic & the rosemary - and some salt & pepper to taste.
Add the stock, the red wine & the tomato purée as well as the sugar (resp. sugar syrup or honey).
As soon as all is combined dump the roulades in the mess & close the frying pan w/ a fitting lid.
Braise for about 2,5 - 3 hours.
Save the roulades which should be very soft now & remove the pins resp. the butcher's string. Discard the bay leaves & the rosemary twigs.
Smooth the sauce w/ a handheld electric blender. Add some salt & pepper to taste.
Ready for serving.