Tip the black beans into a food processor and pulse a few times until they are crushed but not totally puréed. (Alternatively, smash them with a potato masher). Tip into a large bowl.
Trim and finely chop the spring onions, and chop the jalapeño slices. Add both to the bowl, followed by the breadcrumbs, lime zest and juice, garlic, coriander, soy sauce and tahini. Season with salt and pepper.
Mix the ingredients well until fully combined, then roughly divide into 5-6 pieces (or 7-8 for smaller burgers).
Use a burger press or shape the burgers by hand, then place on a baking tray covered in baking paper and refrigerate (or freeze) until required.
TO BBQ: Brush each side with a little oil and cook for 5 minutes on each side.
TO OVEN BAKE: Brush each side with oil and cook at 190°C / 375°F / Gas Mark 5 for 20 minutes.
TO FRY: Fry in a little oil for 5 minutes on each side.
Serve in a bun with smashed avocado, tomato slices, lettuce, red onion, gherkins or a slice of dairy-free melty cheese and plenty of ketchup.