How about 'en croute'? I just think it might improve it. Anyway, my approach would be to marinate the mushrooms first. Then make an asparagus pesto. You could make the terrine en croute layering the mushrooms, asparagus, and pesto inside the puff pastry or you could do them individually by stuffing the mushrooms and wrapping them in puff pastry individually.
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http://www.nytimes.com/recipes/7212/Mushroom-Terrine.html