Mix the sugar snap peas, peas, broad beans and radish with the chillies and herbs in a bowl. Add the chardonnay vinegar and olive oil, and toss to coat.
Heat grill to high. Brush the bread with oil and sprinkle with sea salt. Grill for 2 mins each side until lightly charred. Put each piece of toast on a small plate, then halve burratas and gently spread over the toast. Divide the summer beans, pile on top and season to serve.