Place potatoes in a large pot of cold salted water.
Bring to a boil and then then turn the heat to medium and let the potatoes simmer until they are fork tender. (20-25 mins).
Drain the potatoes and set aside to dry.
Thorough dry the pot that was used to boil the potatoes to make the dressing, or use a deep skillet.
Heat three tablespoons of oil in the pot and add the mustard seeds.
Once the mustard seeds start popping and are fragrant add the shallots and cook for 2-3 minutes until translucent.
Add turmeric to the mustard seed and shallot mixture and season with salt.
Place boiled potatoes in the pot with the warm dressing, and cook on medium-high to allow the potatoes to get crispy on the outside.
Once the potatoes are evenly coated with the shallot mixture and golden brown add lemon juice, peas, fresno chili, and herbs.
Toss well. Serve warm or at room temperature.