Bring a pot of water to the boil and boil your soba noodles for 4 minutes. Drain and rinse under cold water and transfer to a bowl of cold water to wash thoroughly. Transfer to a clean bowl, drizzle in sesame oil and use your hands to toss the noodles to make sure they're coated in the oil. Set aside.
Divide the tamari soy sauce, beef stock granules and Furikake between two 400 ml preserving jars. Add half the shredded turkey or chicken to each of the jars and top with half of the soba noodles.
Add the spinach and finally the carrots and pop the lids on.
Bring a flask of boiling water with you to work (or play!) and when it comes time to eat, fill the jars with the hot water, pop the lids back on and leave to sit for three minutes while everything heats up.