What kind of organization is it? (Not that this probably matters for the hypo, but it's odd that it's silent).
Are the recipes an asset of the organization? If so, you could argue a breach of fiduciary duty with the cookbook, since G benefits but not the organization.
The plan to expand can bring in various breahes such as a breach of loyalty, breach of fiduciary duty, and breach of duty to cooperate. Again, these could be argued for either side. For example, G is working to better the place, and H isn't playing along. Or G is overexpanding and H is being harmed.
Is there a duty of care argument related to the failing business? Does that only relate to the failed expansion?
Are there authority questions related to the expansion? Since G's liabilities include rent, you could argue that he had the authority to expand, but you might also say that both were required to sign off on any expansion.
Just a few unorganized thoughts off the top of my head.