How to convert slow cooker recipes to pressure cooker with different cooking times?

Question

Google results for this question either don't answer the question at all or don't address what happens when multiple ingredients have different pressure cooking times. I'm specifically looking to convert this recipe:

This site says if it takes 8 hours in the slow cooker, it'd take 1 hour in the pressure cooker. Okay, but the recipe involves parsnip and turnip, which my pressure cooker manual says to cook for 1-2 and 3-5 minutes, respectively. I have a 4 quart Presto pressure cooker that goes up to 15 psi which I believe is the standard pressure.

1. Is there a better conversion rule than 8 hour -> 1 hour (assuming 15 psi)? In my experience, at 15 psi, stew beef would fall apart after only 30'.
2. What do I do about the different cooking times? Am I supposed to cook the meat by itself for 1 hour, quick-release the pressure under cold running water, add the turnips, bring the cooker back to pressure, quick-release again, add the parsnips, and finally bring the cooker back to pressure again?

Answer 1

There is no rule, you should use the cooking times in your chart or a reputable timing chart, I use this one hippressurecooking.com/pressure-cooking-times

Basically, you'll want to phase-in the ingredients. That means, cook the beef roast for the time your cooking chart says, say 30 minutes, then open the pressure cooker and add the vegetables and pressure cooker them for their cooking time 4 minutes.

BTW, that same blog has a section where you can post a recipe and they will convert it to the pressure cooker for you. That's here: hippressurecooking.com/recipe-conversions