Perfect atop a steak or tossed with pasta, this mushroom sauce is very simply to make and completely dairy-free but sacrifices nothing in terms of texture and flavour.
Add the sesame oil along with a tablespoon of olive oil to a large skillet and set over medium-high heat. Once shimmering, add the mushrooms along with a generous pinch of salt. Cook, stirring occasionally, until the mushrooms have released all of their moisture, have reduced in size considerably and are deeply browned, about 10 minutes.
Add the shallot and cook, stirring constantly, until it's softened and translucent - about 2 minutes.
Add the garlic and the thyme. Cook until very fragrant, only about 30 seconds. Sprinkle over the flour and cook, stirring constantly, for another 2-3 minutes.
Pour over the white wine and stir to combine. Allow the wine to reduce almost entirely and for the strong alcoholic smell to cook off - this will take 1-2 minutes.
Pour over the vegetable stock and, stirring constantly, bring to a simmer. Off heat, stir in the tahini. Season with salt and pepper to taste and serve immediately.