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1
Place prepared chiles (see note below for prep info) in a blender along with the water, lime juice, vegetable oil, garlic, thyme, cayenne pepper, cumin and salt.
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Blend until smooth.
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3
Toss in a large bowl with shrimp until coated.
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Let the mixture sit for 15 to 30 minutes.
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5
Meanwhile, heat about 1/4 inch of vegetable oil in a large skillet over medium-high heat.
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6
Fry 1 tortilla at a time, flipping once to cook both sides.
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7
This will take about 1 minute per side or until crisp and golden brown.
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Transfer tortillas to a paper towel-lined baking sheet to drain.
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9
Remove skillet from heat; drain oil, then return skillet to stove top.
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10
Make the guacamole: Halve and pit the avocados.
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Put the flesh into a bowl annd mash until mostly smooth.
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Add the white parts of the green onions, cilantro, lime juice, salt and cayenne pepper.
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Stir to combine.
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14
Heat reserved skillet over medium-high heat.
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15
Cook shrimp mixture for about 2 minutes or until warmed through.
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Assemble the tostadas: Spread guacamole on top of each tostada, then top with cooked shrimp.
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17
Top with a dollop of sour cream, chopped tomato and reserved green parts of green onions.
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Serve with lime wedges.
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Note: To prepare fresh peppers (whether Hatch chiles or poblano pepper) for this recipe, roast them over an open flame on the stovetop until well charred; place them in a plastic bag for 10 minutes, then peel the skins and remove the stems and the seeds.
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Recipe adapted from Food Network.