Step 1

In a small saucepan bring broth to boiling. Add rice; reduce heat. Cover and simmer about 40 minutes or until liquid is absorbed. Stir in frozen riced butternut squash. Let stand 5 minutes.

Step 2

Meanwhile, for spicy tomatoes, in a bowl stir together the next five ingredients (through tahini).

Step 3

Stir rice vinegar and maple syrup into brown rice mixture.

Step 4

Lay a sushi mat on a cutting board; place a nori sheet lengthwise on mat. With damp fingers, spread one-fourth of the rice mixture over bottom two-thirds of the nori, leaving a ¼-inch border on side edges. Arrange one fourth of the avocado, cucumber, carrots, tomato mixture, and scallions along center of rice layer. Roll up nori toward the unfilled edge, using sushi mat to lift and tightly roll. Brush unfilled edge with water and press over top of roll. Repeat with remaining ingredients, making four rolls total. Slice each roll into 1-inch slices to serve.