1 head of garlic, separated into cloves, peeled and chopped
4 garlic cloves, sliced
1 onion, diced
few thyme sprigs
1 tsp chopped fresh thyme
500ml/18fl oz chicken stock
1 tbsp plain flour
1 bay leaf
salt and freshly ground black pepper
陆 tbsp sherry vinegar
3 tbsp duck fat
2 free-range egg yolks
1 slice day-old bread, crusts removed and cut into cubes