Heat oil on medium-high heat in a wide pan and add in mustard seeds. Once they start to pop, add in curry leaves and peanuts.
Saute for a few seconds before adding in the chopped onion. Let it fry for about a minute until it starts to soften and brown along the edges.
Add in chopped potatoes and fry for 3-4 minutes until the potatoes start to soften.
Add in peas, spices and salt, and give it a good mix.
Add in the washed poha, mix well and let it cook covered for another 4-5 minutes, until the poha softens. Make sure to give it a stir in between to prevent it from burning.
Garnish with fresh cilantro and a generous squeeze of fresh lemon juice.