In a medium bowl, whisk the mustard, relish and honey. Whisk in 1/4 cup oil. Add the cabbage and season with salt and pepper; toss.
Using a food processor, grind the almonds. Stir in the breadcrumbs and thyme. Place in a shallow bowl. Place the flour and beaten eggs in 2 other shallow bowls. Halve the tilapia fillets crosswise, making 8 small pieces of fish. Pat the fish dry and season with a little salt. Dip the fish first in the flour, then in the beaten egg, then in the breadcrumb mixture.
In a large skillet, heat the remaining 1 tablespoon oil, 1 turn of the pan, over medium heat. Add the butter to melt. Add the coated fish and cook, turning once, until brown and crisp, 3 minutes per side. Douse the fish with the lemon juice. Stack 2 pieces of fish and a big pile of the slaw on the toast. Halve the sammies and serve with the potato chips.