Braune Bohnen (Green Beans in Gravy)

Yield:	4 Servings
Categories:	Beans, German

500	g	Cut green beans, sliced on the diagonal (a generous lb)
		Salt
2	tb	Flour
50	g	Far (3 1/2 Tbsp)
		A bit water
1		Onion studded with 2 cloves
1		Bay leaf
		Vinegar to taste
		A bit of sugar