Pre-heat the oven to 425 degree. In a medium bowl combine the radishes with the olive oil and salt and toss to coat evenly. Arrange the radishes cut side down in one layer on a roasting pan or sheet tray. Roast the radishes in the oven for about 25-30 minutes or until tender and lightly browned. In a medium skillet, melt the butter. Add the warm radishes when the butter starts to brown and toss to coat the radishes with the butter. Remove from the heat and add the fresh chopped herbs and a pinch of salt. Finish with a squeeze of fresh lemon juice.