Wash fresh fruit. Cut apples and pears into 4 pieces, remove the core. Cut plums in half and remove pits. Remove the grapes from the brush. Cut each berry in half.
Using a food processor, cut apples and pears into cubes. Place in a bowl and drizzle with lemon juice. Cut plums in the same cubes.
Lay the peaches on a paper towel and let dry.
Using a food processor, cut the peaches into cubes. Add plums, peaches and grapes to a bowl with apples and pears. Sprinkle 1 tbsp. l. sugar, mix thoroughly, cover and refrigerate.
Prepare the sauce. Wash the mint, pat dry and separate into leaves. In a saucepan, dissolve the remaining sugar in 0.5 cups of water. Put on fire and bring to a boil. Add mint leaves. Cook over low heat until liquid is reduced by half.
Pass the sauce through a fine sieve and let cool. Mix mint syrup with yogurt and dress salad. Serve cold.