Molho demi-glace

Name: Molho demi-glace
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Yield: 1
Cuisine: Pt
Ingredients: 30 g de manteiga; 40 g de farinha de trigo; 1/2 litro de molho Brun; 1 colher (café) de purê de tomates