Melt 25 g butter. Finely crumble the crackers in a freezer bag with a rolling pin. Knead with the liquid butter. Place four hors d'oeuvre rings or rings made of aluminium foil folded several times (each approx. 6 cm Ø) on a tray lined with baking paper.
Spread the cracker mixture in it, press it firmly to the bottom and chill for about 15 minutes.
Soak the gelatine in cold water. Mix the gorgonzola and crème fraîche, season with a little salt and pepper. Squeeze the gelatine and dissolve at low heat. Stir in 1-2 tablespoons of gorgonzola cream and stir into the rest of the cream.
Chill for 5-10 minutes. Whip cream until stiff and fold in. Spread the cream into the rings. Chill for about 3 hours.
Wash the pears, dab dry, quarter, core and cut into thin slices. Wash thyme stalks and pat dry. Melt 2 tablespoons of butter in a frying pan. Steam the pears and thyme for about 1 minute, turning them over, sprinkle with 1 tbsp. sugar and caramelise briefly.
Deglaze with vinegar and 3 tablespoons of water, bring to the boil briefly. Season to taste with sugar and pepper.
Remove gorgonzola tartlets from the rings, arrange on plates with pear wedges and sauce.