Prepare the vegetables: mince half the onion, slice the other half thinly. Slice carrot into rounds and cut into heart shapes. Mince leftover carrot. Cut broccoli into florets and trim shimeji mushrooms.

Microwave minced onion and carrot for 1 minute at 600W, then let cool.

Microwave broccoli with 1 tbsp water for 1–1.5 minutes at 600W.

Mix breadcrumbs and milk in a bowl. Add ground meat, cooled vegetables, and seasonings. Mix until sticky and form into two heart shapes.

Heat butter in a pan over medium heat. Sauté sliced onion and shimeji mushrooms until softened, then push to the side. Add meat patties and sear both sides until browned.

Add sauce ingredients and heart-shaped carrots to the pan. Cover and simmer on low heat for 8–10 minutes until cooked through.