Mushroom and white wine cream sauce

Name: Mushroom and white wine cream sauce
Prep time: 10 min
Cook time: 30 min
Total time: 30 min
Yield: 600 g
Ingredients: 12 g dried porcini mushrooms; 230 g water; 100 g fresh portobello mushrooms; 50 g unsalted butter; 60 g eschalots; 120 g dry white wine; 1 tsp Chicken stock paste; 125 g pouring (whipping) cream; 25 g plain flour; ¼ - ½ tsp salt; 2 pinches ground black pepper