1.Heat oil in a 6-litre (24-cup) pressure cooker; cook chorizo, stirring, until browned. Remove from cooker.
2.Cook chicken in cooker, in batches, until browned. Remove from cooker.
3.Cook brown onion, capsicum, celery and garlic in cooker, stirring, until vegetables soften. Add spices; cook, stirring, until fragrant. Add rice; stir to coat in onion mixture. Return chicken and chorizo to cooker with paste, tomatoes, stock and okra; secure lid. Bring cooker to high pressure. Reduce heat to stabilise pressure; cook 10 minutes.
4.Release pressure using the quick release method (see below); remove lid. Season to taste. Serve gumbo sprinkled with green onion.
If you have an electric pressure cooker you won’t need to reduce the heat to stabilise pressure, your cooker will automatically stabilise itself. Always check the manufacturer’s instructions before using. Quick release method: Each time the lid is removed from the cooker, the pressure must be released quickly first. Use tongs (steam can burn your fingers) to turn the pressure valve on top of the cooker to open the valve and release the steam. We use this method when adding ingredients and when checking the food toward the end of cooking time.