Cook the ground beef in a skillet over medium-high heat until no longer pink and starting to get a little crispy. Add the soy sauce, sesame oil, salt, pepper, garlic powder, and ground ginger and toss well.
In a small pot or saucepan, add the coconut milk, red curry paste, soy sauce, and broth. Bring to a simmer, stirring, until smooth and combined.
Slice the cucumbers and cook or prepare the rice (frozen or microwave rice works great here).
Assemble bowls with rice, cucumber, and beef, then cover with the warm coconut broth.
Garnish with green onion if desired and serve.