Heat Milk and Cream: Slowly warm milk and cream to 32°C (90°F), stirring gently.
Prepare Grouse Meat: Cook grouse thoroughly, then shred finely. Season lightly if desired.
Add Culture and Rennet: Stir in cheese culture (if using), then add rennet. Let sit undisturbed 30–45 minutes until curd forms.
Cut Curds: Slice curds into 1–2 cm cubes to release whey. Stir gently.
Drain and Press: Place curds into cheesecloth-lined mold. Press with moderate weight 6–12 hours, turning occasionally.
Aging / Storing: Soft cheese: refrigerate 1–2 days. Aged cheese: wrap and refrigerate 2–4 weeks, flipping weekly.