To find the ratio of the number of burgers without onions to the number of burgers with onions:
- Number of burgers without onions = 1
- Number of burgers with onions = 1
The ratio is given by the formula:
\[ \text{Ratio} = \frac{\text{Number of burgers without onions}}{\text{Number of burgers with onions}} = \frac{1}{1} = 1 \]
Therefore, the ratio of the number of burgers without onions to the number of burgers with onions is 1.