Cold Natto Udon

Bahan-bahan (1 porsi)

• 2 okra
• 1 Japanese or Persian cucumber
• 5 shiso leaves (perilla/ooba) ((or more, to taste))
• 1 large egg (50 g w/o shell)
• 1 umeboshi (Japanese pickled plums)
• 1 package natto (fermented soybean) ((with sauce packet))
• 2 Tbsp kimchi
• 1 inch nagaimo/yamaimo (mountain yam)
• 1 tsp toasted white sesame seeds
• 1 serving udon noodles ((frozen; ½ lb, 250 g per serving))
• 1 Tbsp mentsuyu (concentrated noodle soup base)
• 3 Tbsp water
• ice cubes