Finely dice the red onions and place in a medium large mixing bowl.
Add the freshly squeezed lime juice, cumin and a dash of pepper. Stir and add the oil. Set bowl aside to let flavours macerate.
Halve the cherry tomatoes and set aside.
Slice and deseed the mini peppers. Set aside in a seperate bowl.
Heat a nonstick large wok or skillet over medium high heat. Once hot, add the corn. If using frozen corn, thaw first by running under hot tap water. Pat dry with a clean towel.
Stir corn until slightly charred about 2 to 5 minutes. Place in a medium large mixing bowl. With a clean damp cloth wipe the wok to remove blackened char.
Stir fry the tomatoes until slightly charred and place in bowl with the corn. Stir fry the peppers until charred and add them as well to the mixing bowl.
Spoon the corn mixture into the bowl with the onions.
Deseed the cucumbers by slicing them in half and with a spoon scooping out the seeded centers. Slice thinly and place in the bowl with the corn.
Peel and slice the peaches into thin strips lengthwise and add to the bowl with the corn and onions. Gently stir salad until well mixed.
To serve: Place argula onto 4 salads plates. Spoon salad over it.
Add cheese, crushed red pepper if adding and mint leaves as garnish.