how would you use an instant pot, (pressure) to cook this dish?

I'm back, Elysa. You can use an instant pot to sear your meat and cook your veg, but the results are usually better on stovetop. Therefore, I recommend following steps 2 and 3 but using a large cast-iron pan (or another nonstick pan) instead of a Dutch oven. For step 4, add the veg (and brown bits!), stock, brisket, and orange juice mixture to your instant pot and follow the device's instructions for brisket!

Hi Elysa - I'm typing up an answer for you - hang on just a few minutes!