Wash spinach leaves 2-3 times and dry them on clean kitchen towels or in a salad spinner.
Prepare the dressing by whisking all ingredients in a small bowl.
Slice paneer block into 8 pieces.
Marinate the paneer in half the the dressing for 10 minutes.
Place a grill pan on the stove at high heat. Brush some oil on it and place the drained marinated paneer pieces. Grill each side for 45 seconds or so, until grill marks appear. Remove and keep aside.
Toss the spinach leaves, bell pepper slices, mango wedges in a bowl with the dressing. Use any leftover marinade in this.
Arrange them on a platter. Place the grilled paneer pieces over the salad.
Top with toasted pumpkin seeds.