If you thought pea protein was weird, you might want to sit down for this. The next wave of alternative burgers could be made from hemp, mung beans or even crickets.

As the plant boom attracts consumers and investors, the pea — the preferred protein source for companies such as Beyond Meat Inc. — is facing some challengers. Critics say the legume isn’t the nutritional powerhouse that proponents claim it is, while others say alternatives could offer better taste.

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