Prepare rice according to package directions, then fluff and stir in lime juice, cilantro and salt.
Drain and mash black beans with drained canned tomatoes, corn, minced jalapeño and salt, then warm in a skillet.
Spread bean mixture onto half of each tortilla, fold in half, then cook quesadillas in a dry skillet over medium-high heat until golden and crispy on both sides.
Cut each quesadilla into triangles.
Serve quesadillas with cilantro-lime rice on the side.
Photo: Daniel Lloyd Blunk-Fernández / Unsplash