Can anyone help you with this metaphor tasted like lime and grease?

If I were to say that my dish of Thai noodles tasted like lime and grease, that would be a literal, rather than metaphorical statement. Lime has a distinctive, tart flavor, and grease also has a flavor, which is generally undesirable - food should not taste too greasy. If, however, I were to say that my new job tastes like lime and grease, that would be quite metaphorical, since jobs are not food and they do not have actual flavors. I might be suggesting that there is something interesting (the lime) but also something wrong (the grease) with my new situation. It would not be the easiest metaphor to interpret.