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1
In a food processor blend together salsa butter, and salt until combined well.
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2
(Salsa butter may be made 3 days ahead and covered, chilled.)
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3
Heat a dry comal or flat iron griddle over moderately low heat until hot and pan-roast poblanos, tomatoes, and garlic, turning them occasionally to ensure even roasting, until browned and soft throughout, 25 to 30 minutes.
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4
While vegetables are roasting, if using dried morels, in a small bowl soak in hot water until soft, about 15 minutes.
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5
Remove morels from soaking liquid and halve.
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6
Strain soaking liquid through a sieve lined with paper towels into another small bowl, reserving soaking liquid.
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7
If using fresh morels, wash well, pat dry, trim, and halve.
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8
In a small heavy skillet heat oil over moderately high heat until hot but not smoking and saute dried or fresh morels, stirring, until browned lightly, about 1 minute.
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9
If using dried morels, add reserved soaking liquid and boil until liquid is evaporated.
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10
Saute dried or fresh morels, stirring until browned, about 3 minutes more.
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11
Wearing rubber gloves, stem and seed chiles.
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12
Discard tomato stems and garlic stems.
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13
In a food processor pulse chiles, tomatoes, garlic, morels, and epazote until chopped coarse (do not puree).
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14
In a bowl stir together chile mixture, water, and salt.
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15
(Salsa may be made 3 days ahead and chilled, covered.
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16
Bring salsa to room temperature before using.)