Season the cleaned mushrooms in a bowl with sea salt, pepper and lemon juice.
Peel, core and dice the tomato and add to the mushrooms with the white wine and the remaining spices.
Heat the oil in a saucepan, sweat the diced onion in it, add the mushrooms (with the other ingredients) and simmer for about 5 minutes with the saucepan closed and over medium heat.
The mushrooms can be served cold or warm and can also be prepared a day in advance.
I serve them with a baguette as a starter or as an accompaniment to grilled food.