Sándwiches de rosbif, mostaza y berros

Ingredientes

• 50 g butter
• 6 slices brown bread
• 3 slices roast beef finely chopped
• 1 mashed (optional) pickled walnut
• a handful watercress finely chopped
• 1 tbsp crème fraîche
• 2 tsp Dijon mustard

Preparación

1. 1

   Butter the bread and divide the beef between 3 slices.

2. 2

   Add pickled walnut (if using).

3. 3

   Mix the watercress and crème fraîche, season and spread on top.

4. 4

   Add mustard to the remaining bread, top, trim the crusts and cut into 3 fingers.