Pop the mushroom stem out, by turning the mushroom upside down, then push the stem to the right, then to the left. The stem will pop right out.
Cut the stem lengthwise in half to give a flat surface.
Cut the underside of the mushroom cap. If not using the caps for another dish, place the flat side of the cap on the board and slice into 1/4 in slices.
Cut the onion in half and cut into 1/4 in slices
Smash the garlic cloves with the back of the chef’s knife.
Place about 1/3 of the cut mushroom pieces in the pan. Leave alone for about 1 minute, then add a few drops of water and the onion slices and stir.
Allow this mixture of mushrooms and onions to get brown, about 3 to 5 minutes. There will be some sticking on the bottom of the pan (this is the good stuff). If it seems like it is starting to burn, add more drops of water and turn the heat down a little.
Then push the mushrooms and onions to the out side of the pan and add the rest of the mushrooms and the garlic cloves to the cleared center of the pan. Add a few drops of water and stir.
Continue to cook without stirring for a few more minutes. The vegetables should be fragrant and mushrooms and onions should have brown spots and garlic golden.
Add the water one cup at a time, stirring after each cup. bring up to a boil, then simmer on low for 40 minutes with the lid on.