Do not guess its preparation requirements from shape or colour. Frozen portions can look similar while requiring very different handling and cooking.
What the observation tells you
The missing identity may also hide allergens, dates or a previous thawing history. Defrosting it simply to taste a little is not a safe identification method. An appliance repairer cannot determine those food details from a photograph.
A useful next step
Treat the uncertainty cautiously and use appropriate food-safety advice. For future storage, label contents, raw or cooked status where relevant, and dates before freezing. Keep preparation instructions with repacked commercial food.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.