Give the psyllium husks a minute to gel in the wet mix before you combine the two bowls, and stir only until the batter comes together - overmixing is what makes cornbread tough. Serve warm alongside chili, soup or a stew. Leftovers keep in an airtight container at room temperature for up to 3 days, or slice and freeze for up to 3 months; warm briefly in the oven to bring back the soft crumb.