Quickly wash your mushrooms
Then chop fine, I used a food processor
toss them into a dutch oven or anything with a lid and the salt. COVER and let them rest overnight
The next day you will see the color changed and they are resting in a lot of mushroom juice
Chop and cook your shallots in the olive oil in a separate pan, once they are translucent and cooked about 10 minutes.
add all of the ingredients except the xanthin gum and bring to a boil
cover and let cook or 20 minutes
once cooked you need to filter the through a cheese cloth or nut milk bag
return the strained broth to the dutch oven, turn on the heat and reduce by half
Toss the mushrooms into a blender and start to pulse
once your liquid is reduced start adding your liquid and pulsing until you get a very smooth constancy. This took me some time to blend to get to this step.
once its very smooth you can add the xanthin gum if you want to get it closer to the constancy of tomato Ketchup. This will thicken the sauce and you can start adding more of the liquid just a tsp at a time until you reach your desired constancy.
Both the liquid and the smooth mushroom ketchup are ketchup! You can bottle them separately and use both.
Toss in the fridge until cooled then enjoy!