01 - In a large skillet over medium-high heat, brown the beef cubes in batches for 2–3 minutes per side. Transfer the seared beef to the slow cooker.
02 - Add the sliced onions, carrot chunks, potato chunks, minced garlic, and grated ginger to the slow cooker containing the beef. Pour in the beef broth, soy sauce, and Worcestershire sauce. Stir gently to combine all ingredients.
03 - Cover the slow cooker and cook on the LOW setting for 7 hours, or on the HIGH setting for 4 hours, until the beef and vegetables are fork-tender.
04 - Approximately 30 minutes before serving, carefully ladle out about ½ cup of the hot cooking liquid from the slow cooker into a separate bowl. Add the Japanese curry roux blocks to this liquid and stir until they are completely dissolved and the mixture is smooth. Return this thickened curry mixture to the slow cooker and stir thoroughly to integrate it with the stew.
05 - Stir in the frozen peas. Re-cover the slow cooker and continue cooking for the final 30 minutes until the curry sauce has thickened to your desired consistency.
06 - Taste the stew and adjust seasonings if necessary. Serve hot, optionally garnished with sliced green onions and accompanied by steamed white rice.