Add 3 Tbsp avocado oil (or olive oil) and 1 tsp sesame oil (omit sesame oil for AIP) to the Instant Pot inner pot. Press SAUTE to heat the oils.
Add the diced onion (1 large, omit for Low‑FODMAP) and the 10 oz button mushrooms. Cook, stirring occasionally, about 5 minutes, until the onion is translucent and the mushrooms have released their liquid.
Add 1 lb ground turkey, 3 tsp minced garlic (omit for Low‑FODMAP), 1 tsp hot sauce (omit for AIP), 1/2 cup coconut aminos, 1 tsp onion powder (omit for Low‑FODMAP), 1 tsp mustard powder (omit for AIP), and 1 tsp sea salt. Break up the turkey with a spoon and stir to combine, scraping any browned bits from the bottom.
Press CANCEL to stop SAUTE. Secure the lid and set the steam release valve to SEALING. Press PRESSURE COOK / MANUAL and set the time to 5 minutes.
When the cook cycle finishes, perform a QUICK RELEASE by carefully moving the valve to VENTING. When the float valve drops and it’s safe, open the lid away from your face.
Using a slotted spoon or spatula, transfer the turkey mixture to a fine‑mesh strainer set over a bowl to drain and reserve the cooking liquid. Set the drained turkey aside on a plate or bowl.
Pour the reserved cooking liquid back into the Instant Pot. Press CANCEL (if needed) and then press SAUTE. Reduce the liquid, stirring occasionally, about 5 minutes, until it has thickened slightly into a sauce.
Return the drained turkey to the Instant Pot and stir to coat with the reduced sauce; sauté 1–2 minutes more to heat through.
Serve by spooning the turkey mixture into the 12 oz whole hearts of romaine. Garnish with minced chives and grated carrots if desired.