Cheesy Soy Burgers

2 teaspoons prepared horseradish

1 can (15 oz) soybeans, drained, rinsed

1/2 cup shredded reduced-fat Cheddar cheese (2 oz)

1/4 cup unseasoned dry bread crumbs

2 medium green onions, finely chopped (2 tablespoons)

1 teaspoon Worcestershire sauce

1/4 teaspoon pepper

1/8 teaspoon salt

2 tablespoons fat-free egg product or 1 egg white

4 burger buns, split, toasted

4 slices tomato

4 lettuce leaves