Melt the panna cotta and mix with the instant coffee and the dulce de leche. Pass through a fine sieve, portion in the silicone molds and let then set in the refrigerator.
Freeze the panna cotta to unload or store in the freezer.
Place the panna cotta on a plate or on a bottom to choice and then let it thaw gently in the refrigerator.
Finish with a chocolate decoration and the dulce de leche.