Potato Vegetable Samosas

1/2 tsp salt

2 tbsp vegetable oil

3/4 cup warm water

2 1/2 cups peeled and diced yukon gold potatoes , cut into 1/2-inch pieces

1 tbsp fennel seed

1 tbsp cumin seed

2 tsp coriander seed

3 tbsp vegetable oil

1/2 cup finely diced onion

2 cloves garlic , minced

1 inch fresh ginger , peeled and grated

1 pkg (1 lb), frozen chopped spinach , thawed and excess juices squeezed out

1/2 cup frozen peas , thawed

salt and pepper

Vegetable oil for frying