clean and slice mushrooms 1/4 inch thick and bite size
heat duck fat on low heat in a small sauce pan
add milk caps and poach for 10 minutes or until they begin to brown on the edges
using a slotted spoon remove the poached mushrooms onto a papyrus plate and set aside
peel and slice the shallots 1/8 inch thick and mince the garlic clove
heat vegetable oil in a medium size stock pot on medium heat, add the sliced shallots and stir until golden brown, about 10 minutes
add the minced garlic and stir in for 1 minute to release its essence
add mushroom stock, poached mushrooms, salt, pepper, thyme and bring to a boil
in a small bowl blend together the flour and water into a slurry, pour through a strainer in the boiling soup, stir then turn heat down to low and continue simmer for 30 minutes, stirring occasionally
remove from heat, stir in the sherry and set aside
chill in refrigerator for 48 hours
line a cookie tray with 4 x 8 oz soup crocks
heat soup, pour into soup crocks, top each crock with 2 slices of cheese, broil until cheese is dark to golden brown
serve hot