In a cast iron skillet, roast 2 garlic cloves until brown on each side.: The smell when the garlic begins to brown is rich and toasty, with sweet caramel notes that replace the raw, sharp aroma. Roasting in a heavy skillet encourages even browning and a slight crisp on the cut surface, which concentrates the flavor. A common mistake is to rush the heat too high, which can burn the garlic and introduce bitterness. Keep the pan at moderate heat and watch for a warm golden brown. The softened cloves should press easily with a fork and smell nutty and inviting, signaling they are ready to be mashed into the marinade.
Mash the garlic and place in a large bowl with the mushrooms, red onion and bell peppers.: Right away you will notice the mashed garlic blending into the raw vegetables, its aroma mellowing as it meets the cool, crisp mushrooms and crunchy bell peppers . The tactile contrast is pleasing, and tossing them together ensures the garlic will be evenly distributed. Avoid overmashing; leaving the garlic slightly textured gives little bursts of flavor. A typical slip here is adding everything into a bowl where pieces vary wildly in size, which creates inconsistent marination. Aim for even slicing so each bite has balance.
In a medium bowl, combine the remaining ingredients, whisk well then pour over mushrooms.: As you whisk the lemon juice , vegetable broth , olive oil , honey or agave, salt , black pepper , jalapeno , and cilantro , you'll notice the mixture emulsifies slightly, becoming glossy and fragrant. Pouring it over the vegetables releases a sharp citrus scent that immediately brightens the bowl. This step matters because a well blended dressing ensures every slice is coated and will cure evenly. A common error is not whisking thoroughly, which leaves pockets of concentrated salt or acid. Whisk until the liquid looks unified, then fold gently so the delicate mushrooms maintain their texture.
Cover and refrigerate at least a few hours, or overnight.: Cold time is where the magic happens, as the lemon juice firms the mushrooms and the flavors meld into a cohesive whole. You will notice the vegetables soften slightly, and the overall aroma changes from sharp citrus to a rounded, savory brightness. Patience here yields a better texture and deeper flavor complexity. A typical mistake is tasting immediately after dressing, which gives a raw, uneven result. Chill for a minimum of a few hours so the cure has time to work, and if you can, overnight offers the best balance and depth.