My mum bought a ______ ______ ______ cooking dish.

Solution:

To correctly order the adjectives, we follow a general rule for English adjective order. The common order is: Opinion, Size, Age, Shape, Color, Origin, Material, Purpose. In this case, we have 'lovely' (opinion), 'small' (size), and 'porcelain' (material).

1. Opinion: lovely
2. Size: small
3. Material: porcelain

Therefore, the correct order is 'lovely small porcelain'.

Answer: lovely small porcelain