Bring a pot of water to boil. Add in the egg and turn the heat to very low to simmer for 7 minutes. This will give you soft boiled egg.
Place into cold water to prevent over cooking. Peel the egg and cut in half.
Boil your udon noodles. Place the udon noodles into cold water after cooking to cool it down.
Julienne the cucumber and cut the cherry tomatoes in half.
Making the soup base
In your noodle bowl, add in minced garlic, Thai chili, white sesame seeds, soy sauce, lemon juice, oyster sauce and water.
Sauce for dry mixed Udon
For the dry mixed udon, combine soy sauce with brown sugar, sesame seeds, mirin, and rice vinegar into a bowl. Mix together until smooth.
Assembling the bowl
Into the bowl, add in cooked udon noodles, cucumbers, cherry tomatoes, and soft boiled egg. Sprinkle some scallions and toasted white sesame seeds if desired, enjoy!