On-the-go Noodle Soup Jars

• 200 g soba noodles
• 1 vegetable stock cube, quartered
• 1 tbsp soy sauce
• 1 tsp sriracha
• 1 tsp ginger, freshly grated
• 1 cup leftover shredded chicken
• 1 carrot, thinly sliced
• 1 cup baby spinach, roughly chopped
• 2 spring onions thinly sliced
• 4 260 mL (9fl oz.) capacity jars (old peanut butter jars work perfectly)