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Add artichokes to a large bowl and cover with cold water, let them sit for 5-10 minutes.
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Remove from water, and cut stem off, also, trim the tip by about 1 inch. Remove any brown or wilted leaves.
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Add broth and garlic powder to the Instant Pot and stir. Add a trivet or steamer rack and arrange the whole artichokes onto the trivet, tip part up.
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Lock lid and point valve to sealed.
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Cook on High Pressure for 8 minutes followed by a Quick Release.
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Open the lid carefully and remove artichokes to a cutting board, slice in half if desired.
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In a medium bowl, combine all the Sauce ingredients and stir together.
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Squeeze half a lemon over the artichokes, sprinkle some salt and pour the sauce on top or serve it on the side. Garnish with fresh parsley before serving.