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1
Combine chickpeas and 4 cups water in pressure cooker; bring to a boil.
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2
Lock lid in place.
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3
Bring to high pressure over high heat.
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4
Reduce heat, and cook 2 minutes.
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5
Release pressure using automatic pressure release, or carefully transfer cooker to sink, and run cool water over rim of lid.
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6
Remove lid, tilting away from you to let steam escape.
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7
Rinse and drain chickpeas.
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8
Set aside.
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9
Heat oil in pressure cooker over medium-high heat.
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10
Add onion and garlic; saute 3 minutes, or until onion is soft.
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11
Add chickpeas and 3 cups water.
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12
Lock lid in place.
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13
Bring to high pressure over high heat.
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14
Reduce heat, and cook 15 minutes.
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15
Release pressure using automatic pressure release, or transfer cooker to sink, and run cool water over rim of lid.
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16
Remove lid, tilting away from you to let steam escape.
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17
Stir in squash and collards.
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18
Lock lid in place.
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19
Bring to high pressure over high heat.
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20
Reduce heat, and cook 5 minutes.
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21
Release pressure using automatic pressure release, or transfer cooker to sink, and run cool water over rim of lid.
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22
Remove lid, tilting away from you to let steam escape.
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23
Stir in tomatoes; cover, and let stand 5 minutes.
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24
Stir in harissa.
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25
Season with salt and pepper, if desired.
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26
Meanwhile, prepare couscous according to package directions.
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27
Fluff with fork.
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28
Serve tagine over couscous.
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29
Sprinkle with cilantro, and garnish with lemon wedges.