Make this poutine with veal or chicken stock. Yummo!
In a 2 quart pot bring stock to a boil. Add the butter and the flour, whisking continually over high heat, for about 3 min.
Lower the heat to a simmer and continue to cook for around 35 minutes, stirring frequently.
Strain the sauce, and add salt and pepper to taste. If you want your sauce to be thicker, lower the heat to medium and let it reduce further.
For serving: Put a handful of curds in a bowl, cover them with French fries, cover French fries with rest of curd, cover the French fries with the poutine sauce