Cote D' Ivoire Velouté d'Ignames (Cream of Yam Soup)

Name: Cote D' Ivoire Velouté d'Ignames (Cream of Yam Soup)
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: European, Mediterranean, French
Ingredients: 1 1/2 lbs yam (peeled, washed and chopped); 3 leeks (washed and finely chopped); 2 onions (finely chopped); 2 Tablespoons butter; 6 cups water +/-; 1 small can of evaporated milk; salt and freshly-ground black pepper (to taste); 4 slices of stale bread; 3 tbsp groundnut oil